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id="mw-indicator-coordinates" class="mw-indicator"><div class="mw-parser-output"><span id="coordinates"><a href="/wiki/Geographic_coordinate_system" title="Geographic coordinate system">Coordinates</a>: <style data-mw-deduplicate="TemplateStyles:r1156832818">.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}</style><span class="plainlinks nourlexpansion"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Arroyo_Trabuco&params=33_29_24_N_117_39_57_W_type:river"><span class="geo-default"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">33°29′24″N</span> <span class="longitude">117°39′57″W</span></span></span><span class="geo-multi-punct"> / </span><span class="geo-nondefault"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">33.49000°N 117.66583°W</span><span style="display:none"> / <span class="geo">33.49000; -117.66583</span></span></span></a></span></span></div></div> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"><span class="mw-redirectedfrom">(Redirected from <a href="/w/index.php?title=Trabuco_Creek&redirect=no" class="mw-redirect" title="Trabuco Creek">Trabuco Creek</a>)</span></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Major tributary of San Juan Creek in Orange County, California</div> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox"><tbody><tr><th colspan="2" class="infobox-above" style="background-color: #CEDEFF;color: #202122;">Arroyo Trabuco</th></tr><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"><a href="/wiki/File:Arroyo_Trabuco.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/4e/Arroyo_Trabuco.JPG/300px-Arroyo_Trabuco.JPG" decoding="async" width="300" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/4e/Arroyo_Trabuco.JPG/450px-Arroyo_Trabuco.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/4e/Arroyo_Trabuco.JPG/600px-Arroyo_Trabuco.JPG 2x" data-file-width="3648" data-file-height="2736" /></a></span><div class="infobox-caption">Arroyo Trabuco shortly downstream of <a href="/wiki/Interstate_5" title="Interstate 5">Interstate 5</a></div></td></tr><tr><td colspan="2" class="infobox-image"><span typeof="mw:File"><a href="/wiki/File:Arroyo_Trabuco_map-01.png" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Arroyo_Trabuco_map-01.png/300px-Arroyo_Trabuco_map-01.png" decoding="async" width="300" height="279" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Arroyo_Trabuco_map-01.png/450px-Arroyo_Trabuco_map-01.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a7/Arroyo_Trabuco_map-01.png/600px-Arroyo_Trabuco_map-01.png 2x" data-file-width="2501" data-file-height="2325" /></a></span><div class="infobox-caption">Map of the San Juan Creek drainage basin with Arroyo Trabuco subbasin highlighted</div></td></tr><tr><th scope="row" class="infobox-label">Etymology</th><td class="infobox-data">"Trabuco" is Spanish for <a href="/wiki/Blunderbuss" title="Blunderbuss">blunderbuss</a>.</td></tr><tr><th colspan="2" class="infobox-header" style="background-color: #CEDEFF;color: #202122;">Location</th></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label">Country</th><td class="infobox-data">United States</td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label">State</th><td class="infobox-data"><a href="/wiki/California" title="California">California</a></td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label">Region</th><td class="infobox-data"><a href="/wiki/Orange_County,_California" title="Orange County, California">Orange County</a></td></tr><tr><th colspan="2" class="infobox-header" style="background-color: #CEDEFF;color: #202122;">Physical characteristics</th></tr><tr style="display:none;"><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr><th scope="row" class="infobox-label">Source</th><td class="infobox-data"><a href="/wiki/Santa_Ana_Mountains" title="Santa Ana Mountains">Santa Ana Mountains</a></td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><span style="font-weight:normal"> • location</span></th><td class="infobox-data">Northwest of <a href="/wiki/Rancho_Santa_Margarita" title="Rancho Santa Margarita">Rancho Santa Margarita</a></td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><span style="font-weight:normal"> • coordinates</span></th><td class="infobox-data"><span class="geo-inline"><style data-mw-deduplicate="TemplateStyles:r1156832818">.mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct,.mw-parser-output .geo-inline-hidden{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}</style><span class="plainlinks nourlexpansion"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Arroyo_Trabuco&params=33_40_01_N_117_33_59_W_"><span class="geo-default"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">33°40′01″N</span> <span class="longitude">117°33′59″W</span></span></span><span class="geo-multi-punct"> / </span><span class="geo-nondefault"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">33.66694°N 117.56639°W</span><span style="display:none"> / <span class="geo">33.66694; -117.56639</span></span></span></a></span></span><sup id="cite_ref-GNIS_1-0" class="reference"><a href="#cite_note-GNIS-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><span style="font-weight:normal"> • elevation</span></th><td class="infobox-data">4,310 ft (1,310 m)</td></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><th scope="row" class="infobox-label"><a href="/wiki/River_mouth" title="River mouth">Mouth</a></th><td class="infobox-data">San Juan Creek</td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><div style="display:inline;font-weight:normal"> • location</div></th><td class="infobox-data"><a href="/wiki/San_Juan_Capistrano" class="mw-redirect" title="San Juan Capistrano">San Juan Capistrano</a></td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><div style="display:inline;font-weight:normal"> • coordinates</div></th><td class="infobox-data"><span class="geo-inline"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1156832818"><span class="plainlinks nourlexpansion"><a class="external text" href="https://geohack.toolforge.org/geohack.php?pagename=Arroyo_Trabuco&params=33_29_24_N_117_39_57_W_type:river"><span class="geo-default"><span class="geo-dms" title="Maps, aerial photos, and other data for this location"><span class="latitude">33°29′24″N</span> <span class="longitude">117°39′57″W</span></span></span><span class="geo-multi-punct"> / </span><span class="geo-nondefault"><span class="geo-dec" title="Maps, aerial photos, and other data for this location">33.49000°N 117.66583°W</span><span style="display:none"> / <span class="geo">33.49000; -117.66583</span></span></span></a></span></span><sup id="cite_ref-GNIS_1-1" class="reference"><a href="#cite_note-GNIS-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><div style="display:inline;font-weight:normal"> • elevation</div></th><td class="infobox-data">59 ft (18 m)</td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label">Length</th><td class="infobox-data">21.8 mi (35.1 km)</td></tr><tr><th scope="row" class="infobox-label">Basin size</th><td class="infobox-data">54 sq mi (140 km<sup>2</sup>)</td></tr><tr style="display:none;"><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label">Discharge</th><td class="infobox-data"> </td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><span style="font-weight:normal"> • location</span></th><td class="infobox-data"><a href="/wiki/San_Juan_Capistrano" class="mw-redirect" title="San Juan Capistrano">San Juan Capistrano</a><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><span style="font-weight:normal"> • average</span></th><td class="infobox-data">17.4 cu ft/s (0.49 m<sup>3</sup>/s)<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup></td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><span style="font-weight:normal"> • minimum</span></th><td class="infobox-data">0 cu ft/s (0 m<sup>3</sup>/s)</td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><span style="font-weight:normal"> • maximum</span></th><td class="infobox-data">10,000 cu ft/s (280 m<sup>3</sup>/s)</td></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><th colspan="2" class="infobox-header" style="background-color: #CEDEFF;color: #202122;">Basin features</th></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label">Tributaries</th><td class="infobox-data"> </td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><span style="font-weight:normal"> • left</span></th><td class="infobox-data">Tijeras Canyon Creek</td></tr><tr style="padding: 0 0.6em 0.2em 0.6em;line-height: 1.2em;"><th scope="row" class="infobox-label"><span style="font-weight:normal"> • right</span></th><td class="infobox-data">Holy Jim Creek, Falls Canyon Creek, Oso Creek</td></tr></tbody></table> <p><b>Arroyo Trabuco</b> (known also as <b>Trabuco Creek</b><sup id="cite_ref-GNIS_1-2" class="reference"><a href="#cite_note-GNIS-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>) is a 22-mile (35 km)-long stream in coastal southern <a href="/wiki/California" title="California">California</a> in the United States.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Rising in a rugged canyon in the <a href="/wiki/Santa_Ana_Mountains" title="Santa Ana Mountains">Santa Ana Mountains</a> of <a href="/wiki/Orange_County,_California" title="Orange County, California">Orange County</a>, the creek flows west and southwest before emptying into <a href="/wiki/San_Juan_Creek" title="San Juan Creek">San Juan Creek</a> in the city of <a href="/wiki/San_Juan_Capistrano" class="mw-redirect" title="San Juan Capistrano">San Juan Capistrano</a>. Arroyo Trabuco's <a href="/wiki/Drainage_basin" title="Drainage basin">watershed</a> drains 54 square miles (140 km<sup>2</sup>) of hilly, semi-arid land and lies mostly in Orange County, with a small portion extending northward into <a href="/wiki/Riverside_County,_California" title="Riverside County, California">Riverside County</a>. The lower section of the creek flows through three incorporated cities and is moderately polluted by urban and agricultural runoff. </p><p><a href="/wiki/Acjachemen" title="Acjachemen">Acjachemen</a> and <a href="/wiki/Pay%C3%B3mkawichum" class="mw-redirect" title="Payómkawichum">Payómkawichum</a> people lived along the <a href="/wiki/Perennial" title="Perennial">perennial</a> stream in settlements and hunting camps for 8,000 years before the <a href="/wiki/Population_of_Native_California" title="Population of Native California">invasion</a> of <a href="/wiki/Spanish_colonization_of_the_Americas" title="Spanish colonization of the Americas">Spanish colonization</a>.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Villages along the creek included <a href="/wiki/Alauna,_California" class="mw-redirect" title="Alauna, California">Alauna</a> and <a href="/wiki/Putiidhem" class="mw-redirect" title="Putiidhem">Putiidhem</a>.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:1_7-0" class="reference"><a href="#cite_note-:1-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> <i>Trabuco</i> is Spanish for a <a href="/wiki/Blunderbuss" title="Blunderbuss">Blunderbuss</a>, a type of shotgun. Local legend attributes a <a href="/wiki/Franciscan" class="mw-redirect" title="Franciscan">Franciscan</a> missionary friar traveling with the <a href="/wiki/Gaspar_de_Portol%C3%A0" class="mw-redirect" title="Gaspar de Portolà">Gaspar de Portolà Expedition</a> in 1769 for the story that a blunderbuss was lost in the upper canyon by the creek, and so the naming of the area. <a href="/wiki/John_(Don_Juan)_Forster" class="mw-redirect" title="John (Don Juan) Forster">John "Don Juan" Forster</a> received a Mexican land grant in 1846 for the canyon lands and creek and established <a href="/wiki/Rancho_Trabuco" title="Rancho Trabuco">Rancho Trabuco</a> here. </p><p>In its natural state, Arroyo Trabuco supported one of the most significant <a href="/wiki/Steelhead_trout" class="mw-redirect" title="Steelhead trout">steelhead trout</a> runs in Orange County, and birds, large mammals, and amphibians still flourish in <a href="/wiki/Riparian_zone" title="Riparian zone">riparian zones</a> along its undeveloped portions. Trabuco Canyon along upper Arroyo Trabuco, and long, narrow <a href="/wiki/O%27Neill_Regional_Park" title="O'Neill Regional Park">O'Neill Regional Park</a>, formed from the original land grant of Rancho Trabuco in 1982, are popular off-roading, hiking, fishing and camping areas in the watershed. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Course">Course</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=1" title="Edit section: Course"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Arroyo Trabuco begins in the Trabuco Ranger District of the <a href="/wiki/Cleveland_National_Forest" title="Cleveland National Forest">Cleveland National Forest</a>, just west of the Orange–Riverside County border, at an elevation of 4,310 feet (1,310 m).<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> The headwaters of the creek are in the large and deep Trabuco Canyon just north of 4,400-foot (1,300 m) <a href="/wiki/Los_Pinos_Peak" title="Los Pinos Peak">Los Pinos Peak</a> and south of 4,604-foot (1,403 m) <a href="/wiki/Trabuco_Peak" title="Trabuco Peak">Trabuco Peak</a>. The creek flows in this 2,000-foot (610 m) deep gorge for its first 4 miles (6.4 km),<sup id="cite_ref-USACE252_9-0" class="reference"><a href="#cite_note-USACE252-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> receiving Holy Jim and Falls Canyon creeks before it passes the unincorporated community of <a href="/wiki/Trabuco_Canyon,_California" title="Trabuco Canyon, California">Trabuco Canyon</a>, where Live Oak Canyon Creek joins from the <a href="https://en.wiktionary.org/wiki/right_bank" class="extiw" title="wikt:right bank">right</a>.<sup id="cite_ref-USACE252_9-1" class="reference"><a href="#cite_note-USACE252-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-OCWatershedsMap_10-0" class="reference"><a href="#cite_note-OCWatershedsMap-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:TrabucoCreekCulvert.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/TrabucoCreekCulvert.jpg/220px-TrabucoCreekCulvert.jpg" decoding="async" width="220" height="231" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/4/45/TrabucoCreekCulvert.jpg/330px-TrabucoCreekCulvert.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/4/45/TrabucoCreekCulvert.jpg/440px-TrabucoCreekCulvert.jpg 2x" data-file-width="491" data-file-height="515" /></a><figcaption>Arroyo Trabuco crosses underneath Interstate 5 in a culvert. Note that at first, there was only one culvert. Due to increasing flood control requirements, there are now two.</figcaption></figure> <p>Once out of the mountains, Arroyo Trabuco changes from a swift mountain torrent to a meandering, braided stream crossing a wide sandy bed known as the "Plano Trabuco".<sup id="cite_ref-USACE252_9-2" class="reference"><a href="#cite_note-USACE252-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> After entering the city limits of <a href="/wiki/Rancho_Santa_Margarita,_California" title="Rancho Santa Margarita, California">Rancho Santa Margarita</a>, the creek flows southwest through the long, narrow wilderness preserve of <a href="/wiki/O%27Neill_Regional_Park" title="O'Neill Regional Park">O'Neill Regional Park</a>. It crosses under <a href="/wiki/California_State_Route_241" title="California State Route 241">California State Route 241</a>, a <a href="/wiki/Toll_road" title="Toll road">toll road</a> that follows the western foothills of the Santa Ana Mountains, and passes close to <a href="/wiki/Lake_Mission_Viejo" title="Lake Mission Viejo">Lake Mission Viejo</a>, a popular recreational lake in the city of <a href="/wiki/Mission_Viejo,_California" title="Mission Viejo, California">Mission Viejo</a>.<sup id="cite_ref-OCWatershedsMap_10-1" class="reference"><a href="#cite_note-OCWatershedsMap-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-USACE,_p._2-53_11-0" class="reference"><a href="#cite_note-USACE,_p._2-53-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p><p>Still steadily bending southwards, Arroyo Trabuco is joined by Tijeras Canyon Creek from the <a href="https://en.wiktionary.org/wiki/left_bank" class="extiw" title="wikt:left bank">left bank</a>, then passes under a high bridge for Oso Parkway and leaves the southern boundary of the regional park.<sup id="cite_ref-USACE,_p._2-53_11-1" class="reference"><a href="#cite_note-USACE,_p._2-53-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> After passing <a href="/wiki/Saddleback_College" title="Saddleback College">Saddleback College</a>, located near the southern junction of <a href="/wiki/California_State_Route_73" title="California State Route 73">California State Route 73</a> and <a href="/wiki/Interstate_5" title="Interstate 5">Interstate 5</a>, the creek flows through a residential community and is diverted into twin <a href="/wiki/Culvert" title="Culvert">culverts</a> underneath the interstate.<sup id="cite_ref-OCWatershedsMap_10-2" class="reference"><a href="#cite_note-OCWatershedsMap-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p><p>The creek flows over two large man-made <a href="/wiki/Drop_structure" title="Drop structure">drop structures</a>, the first of which marks the beginning of a small canyon that it flows through almost until it reaches downtown San Juan Capistrano.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> Passing into the northernmost extreme of San Juan Capistrano, it is joined by its largest tributary, <a href="/wiki/Oso_Creek" title="Oso Creek">Oso Creek</a>, from the right. The creek flows south through orchards until it is forced into a concrete channel, passes by <a href="/wiki/Mission_San_Juan_Capistrano" title="Mission San Juan Capistrano">Mission San Juan Capistrano</a>, and joins with San Juan Creek in downtown San Juan Capistrano.<sup id="cite_ref-OCWatershedsMap_10-3" class="reference"><a href="#cite_note-OCWatershedsMap-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Discharge">Discharge</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=2" title="Edit section: Discharge"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>On Arroyo Trabuco, the <a href="/wiki/USGS" class="mw-redirect" title="USGS">USGS</a> operated two stream gauges, one from 1932 to 1981, and the second from 1973 to 2008, both near its mouth. The USGS refers to this creek as "Arroyo Trabuco". For the former gauge, the average flow was 6.22 cubic feet per second (0.176 m<sup>3</sup>/s) or 4,500 acre-feet (5,600,000 m<sup>3</sup>) per year, and the highest recorded flow was on February 6, 1937, water flow 9,240 cubic feet per second (262 m<sup>3</sup>/s), with a stage of 6.8 feet (2.1 m).<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> For the latter gauge, the average discharge was 17.4 cubic feet per second (0.49 m<sup>3</sup>/s), 12,600 acre-feet (15,500,000 m<sup>3</sup>) per year. The largest flow was 10,000 cubic feet per second (280 m<sup>3</sup>/s) (estimated) on 23 February 1998, with a peak stage of 19.81 feet (6.04 m). The USGS states that "All or part of the record affected by Urbanization, Mining, Agricultural changes, Channelization, or other", explaining the large discrepancy in average flows between early and more recent records.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> Above their confluence, Arroyo Trabuco actually is longer than San Juan Creek, but San Juan Creek drains a larger area. </p> <div class="mw-heading mw-heading2"><h2 id="Watershed">Watershed</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=3" title="Edit section: Watershed"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Geography_and_boundaries">Geography and boundaries</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=4" title="Edit section: Geography and boundaries"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:TrabucoFalls.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/TrabucoFalls.JPG/220px-TrabucoFalls.JPG" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3c/TrabucoFalls.JPG/330px-TrabucoFalls.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3c/TrabucoFalls.JPG/440px-TrabucoFalls.JPG 2x" data-file-width="2048" data-file-height="1536" /></a><figcaption>An artificial concrete waterfall on Arroyo Trabuco, downstream of the <a href="/wiki/Metrolink_(California)" title="Metrolink (California)">Metrolink</a> rail bridge and upstream of the <a href="/wiki/Oso_Creek" title="Oso Creek">Oso Creek</a> confluence</figcaption></figure> <p>The Trabuco watershed covers 54 square miles (140 km<sup>2</sup>) in the northern and far eastern parts of the San Juan Creek watershed. Located in an arid coastal basin in southern Orange County, the creek's watershed comprises 40.3% of the 133.9-square-mile (347 km<sup>2</sup>) San Juan Creek watershed. It makes a wide bend from northeast to southwest, bounded by the Santa Ana Mountains to the north, the foothills of the Santa Anas to the west, and a <a href="/wiki/Drainage_divide" title="Drainage divide">drainage divide</a> within the San Juan watershed itself on the south and east.<sup id="cite_ref-OCWatershedsMap_10-4" class="reference"><a href="#cite_note-OCWatershedsMap-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> </p><p>Although much of the Arroyo Trabuco watershed is bounded by the San Juan Creek basin it also borders on several other major Orange and Riverside County watersheds. Listed from east to west, the major San Juan Creek subwatersheds it bounds are <a href="/wiki/Bell_Canyon" title="Bell Canyon">Bell Canyon</a>, <a href="/wiki/Ca%C3%B1ada_Gobernadora" title="Cañada Gobernadora">Cañada Gobernadora</a>, Cañada Chiquita and <a href="/wiki/El_Horno_Creek" title="El Horno Creek">El Horno Creek</a>. Arroyo Trabuco's headwaters are actually not physically far from that of Bell Canyon and San Juan Creek, the first of which is the second longest tributary of San Juan Creek. On the west of the Arroyo Trabuco watershed is the <a href="/wiki/Aliso_Creek_(Orange_County)" title="Aliso Creek (Orange County)">Aliso Creek</a> drainage basin, on the north the <a href="/wiki/Santiago_Creek" title="Santiago Creek">Santiago Creek</a>, and on the northeast streams draining into the <a href="/wiki/Lake_Elsinore" title="Lake Elsinore">Lake Elsinore</a> area.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p><p>There are between 140,000 and 145,000 people living in the major cities in the Arroyo Trabuco watershed.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (March 2018)">citation needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading3"><h3 id="Geology">Geology</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=5" title="Edit section: Geology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Geologically the present-day Arroyo Trabuco basin did not exist as early as the end of the most recent <a href="/wiki/Last_Glacial_Period" title="Last Glacial Period">Ice Age</a>. The Santa Ana Mountains, forming the northern, eastern and southeastern boundaries of the entire San Juan Creek watershed, did not begin to form until roughly 5.5 <a href="/wiki/Mya_(unit)" class="mw-redirect" title="Mya (unit)">million years ago</a> (MYA). The Santa Ana Mountains at the headwaters of San Juan Creek are composed primarily of <a href="/wiki/Jurassic" title="Jurassic">Jurassic</a>-age (196.6-145.5 MYA) <a href="/wiki/Igneous" class="mw-redirect" title="Igneous">igneous</a> and <a href="/wiki/Sedimentary_rock" title="Sedimentary rock">sedimentary rock</a> overlain by <a href="/wiki/Cretaceous" title="Cretaceous">Cretaceous</a>-age (145.5-66 MYA) <a href="/wiki/Granite" title="Granite">granite</a>, <a href="/wiki/Gabbro" title="Gabbro">gabbro</a>, <a href="/w/index.php?title=Tolamite&action=edit&redlink=1" class="new" title="Tolamite (page does not exist)">tolamite</a>, <a href="/wiki/Siltstone" title="Siltstone">siltstone</a>, <a href="/wiki/Sandstone" title="Sandstone">sandstone</a> and <a href="/wiki/Conglomerate_(geology)" title="Conglomerate (geology)">conglomerates</a>. The underlying rock of the Santa Ana foothills are <a href="/wiki/Paleogene" title="Paleogene">Paleogene</a>-age (66-2.59 MYA) sandstone.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> </p><p>As the Santa Ana Mountains rose, Arroyo Trabuco first formed as a canyon cut into the southeastern part of the range. Many of the creeks draining the range—including <a href="/wiki/Santiago_Creek" title="Santiago Creek">Santiago Creek</a>, <a href="/wiki/San_Diego_Creek" title="San Diego Creek">San Diego Creek</a>, <a href="/wiki/Bell_Canyon" title="Bell Canyon">Bell Canyon</a> and San Juan Creek—first formed in the same way. The uplift of the <a href="/wiki/San_Joaquin_Hills" title="San Joaquin Hills">San Joaquin Hills</a>, a coastal mountain range generally following the <a href="/wiki/Pacific_coast" title="Pacific coast">Pacific coast</a> of Orange County, created a physical barrier for these streams flowing off the Santa Ana Mountains. But by the <a href="/wiki/Wisconsinian_Glaciation" class="mw-redirect" title="Wisconsinian Glaciation">Wisconsinian Glaciation</a>, an enormous climate change helped solve that problem. During the Wisconsinian Glaciation, a period of time that lasted from about 70,000 to 10,000 years ago, <a href="/wiki/Glacier" title="Glacier">glaciers</a> and <a href="/wiki/Ice_sheet" title="Ice sheet">ice sheets</a> moved south from northern Canada into the northern United States, radically altering the climate of the entire continent. The arid Southern California climate was supplanted by a <a href="/wiki/Temperate_rainforest" title="Temperate rainforest">temperate rainforest</a> climate that would receive rainfall in excess of 80 to 90 inches (2,000 to 2,300 mm) per year. Arroyo Trabuco and other streams along the Orange County coast became powerful rivers that cut their way through the San Joaquin Hills.<sup id="cite_ref-iceagefloods_19-0" class="reference"><a href="#cite_note-iceagefloods-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p><p>This changed climate did not last, and by the time it had ended, several enormous canyons had been cut through the 600-to-1,000-foot (180 to 300 m) high San Joaquin Hills. The Trabuco/San Juan Creek canyon is one of the less prominent ones, and is the last canyon before the San Joaquin Hills continue south into <a href="/wiki/San_Diego_County,_California" title="San Diego County, California">San Diego County</a>. Because of the enormous erosion channels carved out by the Wisconsinian-era rivers, the creeks now flow on broad and deep beds of sediment that have filled these canyons.<sup id="cite_ref-iceagefloods_19-1" class="reference"><a href="#cite_note-iceagefloods-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Pollution_and_modifications">Pollution and modifications</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=6" title="Edit section: Pollution and modifications"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size mw-halign-right" typeof="mw:File/Thumb"><a href="/wiki/File:GroutedSlopingBoulderDrop.JPG" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/GroutedSlopingBoulderDrop.JPG/220px-GroutedSlopingBoulderDrop.JPG" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f0/GroutedSlopingBoulderDrop.JPG/330px-GroutedSlopingBoulderDrop.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f0/GroutedSlopingBoulderDrop.JPG/440px-GroutedSlopingBoulderDrop.JPG 2x" data-file-width="2048" data-file-height="1536" /></a><figcaption>Arroyo Trabuco filled with urban runoff after a storm</figcaption></figure> <p>The Arroyo Trabuco watershed, especially the Oso Creek subwatershed, has been severely affected by suburban development. Lower riparian areas along the creek have been damaged by channelization and contaminated runoff from the creek contributes to pollution problems in <a href="/w/index.php?title=Capistrano_Bight&action=edit&redlink=1" class="new" title="Capistrano Bight (page does not exist)">Capistrano Bight</a> at the mouth of San Juan Creek at <a href="/wiki/Dana_Point,_California" title="Dana Point, California">Dana Point</a>. Such pollutants include <a href="/wiki/Urban_runoff" title="Urban runoff">urban runoff</a>, <a href="/wiki/Fertilizer" title="Fertilizer">fertilizers</a>, heavy metals and oils.<sup id="cite_ref-hydrologicunit_20-0" class="reference"><a href="#cite_note-hydrologicunit-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p><p>There is one dam on Arroyo Trabuco, located inside Trabuco Canyon.<sup id="cite_ref-22" class="reference"><a href="#cite_note-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> There are also many <a href="/wiki/Drop_structure" title="Drop structure">drop structures</a> on the lower creek.<sup id="cite_ref-drops_23-0" class="reference"><a href="#cite_note-drops-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Climate_and_biology">Climate and biology</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=7" title="Edit section: Climate and biology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Wildlife_of_San_Juan_Creek" class="mw-redirect" title="Wildlife of San Juan Creek">Wildlife of San Juan Creek</a></div> <p>The climate of the Arroyo Trabuco watershed is almost entirely semi-arid. <a href="/wiki/Scrubland" class="mw-redirect" title="Scrubland">Scrubland</a> and <a href="/wiki/Chaparral" title="Chaparral">chaparral</a> make up most of the vegetation in the hilly and sometimes mountainous watershed. 16 different vegetation "bands", or zones, have been identified in the San Juan Creek watershed as a whole, and most of these also exist in the Arroyo Trabuco watershed.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> These range from <a href="/wiki/Riparian" class="mw-redirect" title="Riparian">riparian</a> to chaparral, <a href="/wiki/Coastal_sage_scrub" title="Coastal sage scrub">coastal sage scrub</a> and rocky outcroppings where little to no vegetation grows. In the undeveloped Plano Trabuco, there are <a href="/wiki/Grassland" title="Grassland">grasslands</a>, while most of the middle section of the Arroyo Trabuco valley is urbanized. </p> <figure class="mw-default-size mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:Taricha_torosa_Trabuco_Canyon.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Taricha_torosa_Trabuco_Canyon.jpg/220px-Taricha_torosa_Trabuco_Canyon.jpg" decoding="async" width="220" height="136" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Taricha_torosa_Trabuco_Canyon.jpg/330px-Taricha_torosa_Trabuco_Canyon.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/bd/Taricha_torosa_Trabuco_Canyon.jpg/440px-Taricha_torosa_Trabuco_Canyon.jpg 2x" data-file-width="512" data-file-height="316" /></a><figcaption><a href="/wiki/Newt" title="Newt">Newt</a> in Holy Jim Canyon, a tributary gorge of Arroyo Trabuco</figcaption></figure> <p>Riparian zones, consisting of small to medium-sized trees and a variety of other streambank flora, line Arroyo Trabuco, Tijeras Canyon Creek, and the upper tributaries including Live Oak Canyon, Falls Canyon and Holy Jim Canyon. These riparian habitats are now only found in the upper watershed. Oso Creek is heavily developed, and has little to no riparian vegetation.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> Lower Arroyo Trabuco still supports some riparian zones, but they have decreased in health because of the introduction of urban and agricultural runoff. </p><p>Aside from the large mammals including <a href="/wiki/Mountain_lion" class="mw-redirect" title="Mountain lion">mountain lions</a>, <a href="/wiki/Coyote" title="Coyote">coyotes</a>, and <a href="/wiki/Bobcat" title="Bobcat">bobcats</a> (the last <a href="/wiki/California_grizzly_bear" title="California grizzly bear">California grizzly bear</a> in the Santa Ana Mountains was shot near Trabuco Canyon) the creek was once a productive habitat for <a href="/wiki/Steelhead_trout" class="mw-redirect" title="Steelhead trout">steelhead trout</a>.<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> Its upper portions, which include numerous gravel beds and bars, stream pools, and cascades, are suitable habitat for the <a href="/wiki/Anadromous" class="mw-redirect" title="Anadromous">anadromous</a> fish, which still exist as <a href="/wiki/Rainbow_trout" title="Rainbow trout">rainbow trout</a> in upper Arroyo Trabuco. Because of extensive modifications—affecting the stability and water quality of the creek—steelhead no longer migrate to the upper reaches of the Arroyo Trabuco watershed. Conversely, steelhead were sighted in 2003 and 2005 along the creek. A project was proposed in 2005 to build a <a href="/wiki/Fish_ladder" title="Fish ladder">fish ladder</a> into a concrete <a href="/wiki/Drop_structure" title="Drop structure">drop structure</a> in Arroyo Trabuco that blocks steelhead passage. $1.2 million was allocated by the California State Wildlife Conservation Board in 2005 to fund the project, but it has not been begun.<sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Flora">Flora</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=8" title="Edit section: Flora"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Category:California_chaparral_and_woodlands" title="Category:California chaparral and woodlands">California chaparral and woodlands</a></div> <p>The canyon is in the <a href="/wiki/California_chaparral_and_woodlands" title="California chaparral and woodlands">California chaparral and woodlands</a> <a href="/wiki/Ecoregion" title="Ecoregion">Ecoregion</a>, with <a href="/wiki/California_oak_woodland" title="California oak woodland">California oak woodland</a> and <a href="/wiki/Chaparral" title="Chaparral">Chaparral</a> <a href="/wiki/Plant_community" title="Plant community">plant communities</a> of <a href="/wiki/California_native_plants" class="mw-redirect" title="California native plants">California native plants</a>, with <a href="/wiki/Invasive_species" title="Invasive species">invasive plant species</a> of <a href="/wiki/Noxious_weed" title="Noxious weed">Noxious weeds</a> in the riparian and '<a href="/wiki/Bunch_grass" class="mw-redirect" title="Bunch grass">bunch grass</a>' <a href="/wiki/Category:Grasslands_of_California" title="Category:Grasslands of California">grasslands</a>. </p> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=9" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>It is hypothesized that <a href="/wiki/Hokan_languages" title="Hokan languages">Hokan</a>-speaking Native Americans of <a href="/wiki/Shoshone" title="Shoshone">Shoshone</a> origin occupied a 12-mile (19 km)-long, 8-mile (13 km)-wide strip of land along much of central Arroyo Trabuco and most of <a href="/wiki/Oso_Creek" title="Oso Creek">Oso Creek</a>, its major tributary, beginning at an unknown date.<sup id="cite_ref-hokan_28-0" class="reference"><a href="#cite_note-hokan-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> The Shoshoneans centered around the Trabuco/Oso Creek confluence and had a primarily <a href="/wiki/Hunter-gatherer" title="Hunter-gatherer">hunter-gatherer</a> way of life.<sup id="cite_ref-hokan_28-1" class="reference"><a href="#cite_note-hokan-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> Eventually, the people in the Southern Orange County/Northern San Diego County area settled down in semi-permanent villages, and this area became part of the <a href="/wiki/Acjachemen" title="Acjachemen">Acjachemen</a> tribal territory. There were two Acjachemen villages on the main stem of the Trabuco and one on Oso Creek, as well as numerous settlements at the confluence of San Juan Creek and Arroyo Trabuco all the way downstream to the Pacific.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> This was the historic landscape encountered by the <a href="/wiki/Spanish_people" class="mw-redirect" title="Spanish people">Spanish</a> <a href="/wiki/Conquistador" title="Conquistador">conquistadors</a> when they began expeditions to the area in the 18th century.<sup id="cite_ref-30" class="reference"><a href="#cite_note-30"><span class="cite-bracket">[</span>30<span class="cite-bracket">]</span></a></sup> </p><p>In 1769 <a href="/wiki/Gaspar_de_Portol%C3%A0" class="mw-redirect" title="Gaspar de Portolà">Gaspar de Portolà</a> led an expedition to the canyons of the Santa Ana Mountains. They camped on a bluff east of Arroyo Trabuco on the night of July 24–25, and the next day, one of the soldiers found his <i>trabuco</i>, or <a href="/wiki/Blunderbuss" title="Blunderbuss">blunderbuss</a> (the type of gun), missing. The expedition never found the gun, and they named the creek <i>Arroyo Trabuco</i> as a memorial.<sup id="cite_ref-31" class="reference"><a href="#cite_note-31"><span class="cite-bracket">[</span>31<span class="cite-bracket">]</span></a></sup> <a href="/wiki/Mission_San_Juan_Capistrano" title="Mission San Juan Capistrano">Mission San Juan Capistrano</a> was established in 1776 at the confluence of San Juan Creek and Arroyo Trabuco. </p><p><a href="/wiki/Rancho_Trabuco" title="Rancho Trabuco">Rancho Trabuco</a> was a Mexican land grant that covered most of the upper Arroyo Trabuco watershed. Created in 1841, its boundaries were changed in both 1843 and 1846. In 1880, the land was sold to F.L.S. Pioche and the final owners were James L. Flood and Jerome O'Neill, who created the O'Neill Ranch out of the Rancho Trabuco. The name stayed and most of the ranch is now the site of O'Neill Regional Park, which was dedicated on October 5, 1982.<sup id="cite_ref-32" class="reference"><a href="#cite_note-32"><span class="cite-bracket">[</span>32<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=10" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/List_of_rivers_of_Orange_County,_California" title="List of rivers of Orange County, California">List of rivers of Orange County, California</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="Works_cited">Works cited</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=11" title="Edit section: Works cited"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20060313181627/http://www.ocwatersheds.com/watersheds/pdfs/San_Juan_Creek_F5_Report_August_2002.pdf">"San Juan Creek Watershed Management Study: Feasibility Phase"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/U.S._Army_Corps_of_Engineers" class="mw-redirect" title="U.S. Army Corps of Engineers">U.S. Army Corps of Engineers</a></i>. Watershed and Coastal Resources Division of Orange County. August 2002. Archived from <a rel="nofollow" class="external text" href="http://www.ocwatersheds.com/watersheds/pdfs/San_Juan_Creek_F5_Report_August_2002.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2006-03-13<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-06-14</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=U.S.+Army+Corps+of+Engineers&rft.atitle=San+Juan+Creek+Watershed+Management+Study%3A+Feasibility+Phase&rft.date=2002-08&rft_id=http%3A%2F%2Fwww.ocwatersheds.com%2Fwatersheds%2Fpdfs%2FSan_Juan_Creek_F5_Report_August_2002.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AArroyo+Trabuco" class="Z3988"></span></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=12" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width" style="column-width: 35em;"> <ol class="references"> <li id="cite_note-GNIS-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-GNIS_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-GNIS_1-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-GNIS_1-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation encyclopaedia cs1"><a rel="nofollow" class="external text" href="https://edits.nationalmap.gov/apps/gaz-domestic/public/search/names/238777">"Arroyo Trabuco"</a>. <i><a href="/wiki/Geographic_Names_Information_System" title="Geographic Names Information System">Geographic Names Information System</a></i>. <a href="/wiki/United_States_Geological_Survey" title="United States Geological Survey">United States Geological Survey</a>, <a href="/wiki/United_States_Department_of_the_Interior" title="United States Department of the Interior">United States Department of the Interior</a>. 1981-01-19<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-05-26</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=bookitem&rft.atitle=Arroyo+Trabuco&rft.btitle=Geographic+Names+Information+System&rft.pub=United+States+Geological+Survey%2C+United+States+Department+of+the+Interior&rft.date=1981-01-19&rft_id=https%3A%2F%2Fedits.nationalmap.gov%2Fapps%2Fgaz-domestic%2Fpublic%2Fsearch%2Fnames%2F238777&rfr_id=info%3Asid%2Fen.wikipedia.org%3AArroyo+Trabuco" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://wdr.water.usgs.gov/wy2011/pdfs/11047300.2011.pdf">"USGS Gage #11047300 on Arroyo Trabuco at San Juan Capistrano, CA"</a> <span class="cs1-format">(PDF)</span>. <i>National Water Information System</i>. U.S. Geological Survey. 1973–2011<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-05-26</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=National+Water+Information+System&rft.atitle=USGS+Gage+%2311047300+on+Arroyo+Trabuco+at+San+Juan+Capistrano%2C+CA&rft.date=1973%2F2011&rft_id=http%3A%2F%2Fwdr.water.usgs.gov%2Fwy2011%2Fpdfs%2F11047300.2011.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AArroyo+Trabuco" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://wdr.water.usgs.gov/wy2011/pdfs/11047300.2011.pdf">"USGS Gage #11047300 on Arroyo Trabuco at San Juan Capistrano, CA"</a> <span class="cs1-format">(PDF)</span>. <i>National Water Information System</i>. U.S. Geological Survey. 1973–2011<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-05-26</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=National+Water+Information+System&rft.atitle=USGS+Gage+%2311047300+on+Arroyo+Trabuco+at+San+Juan+Capistrano%2C+CA&rft.date=1973%2F2011&rft_id=http%3A%2F%2Fwdr.water.usgs.gov%2Fwy2011%2Fpdfs%2F11047300.2011.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AArroyo+Trabuco" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><a rel="nofollow" class="external text" href="https://edits.nationalmap.gov/apps/gaz-domestic/public/search/names/250576">U.S. Geological Survey Geographic Names Information System: Arroyo Trabuco</a></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text">Associated Press. <a rel="nofollow" class="external text" href="https://www.usatoday.com/tech/science/discoveries/2006-03-03-prehistoric-mill_x.htm">Prehistoric milling site found in California</a>. USA Today. Accessed 2010-05-22.</span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFMartínez2009" class="citation book cs1">Martínez, Roberta H. (2009). <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/402526696"><i>Latinos in Pasadena</i></a>. Charleston, SC: Arcadia. p. 10. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-7385-6955-0" title="Special:BookSources/978-0-7385-6955-0"><bdi>978-0-7385-6955-0</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/402526696">402526696</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Latinos+in+Pasadena&rft.place=Charleston%2C+SC&rft.pages=10&rft.pub=Arcadia&rft.date=2009&rft_id=info%3Aoclcnum%2F402526696&rft.isbn=978-0-7385-6955-0&rft.aulast=Mart%C3%ADnez&rft.aufirst=Roberta+H.&rft_id=https%3A%2F%2Fwww.worldcat.org%2Foclc%2F402526696&rfr_id=info%3Asid%2Fen.wikipedia.org%3AArroyo+Trabuco" class="Z3988"></span></span> </li> <li id="cite_note-:1-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-:1_7-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFKoerperMasonPeterson2002" class="citation book cs1">Koerper, Henry; Mason, Roger; Peterson, Mark (2002). <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/745176510"><i>Catalysts to complexity : late Holocene societies of the California coast</i></a>. Jon Erlandson, Terry L. Jones, Jeanne E. Arnold, Cotsen Institute of Archaeology at UCLA. Los Angeles: Cotsen Institute of Archaeology at UCLA. pp. 64–66, 79. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-1-938770-67-8" title="Special:BookSources/978-1-938770-67-8"><bdi>978-1-938770-67-8</bdi></a>. <a href="/wiki/OCLC_(identifier)" class="mw-redirect" title="OCLC (identifier)">OCLC</a> <a rel="nofollow" class="external text" href="https://search.worldcat.org/oclc/745176510">745176510</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Catalysts+to+complexity+%3A+late+Holocene+societies+of+the+California+coast&rft.place=Los+Angeles&rft.pages=64-66%2C+79&rft.pub=Cotsen+Institute+of+Archaeology+at+UCLA&rft.date=2002&rft_id=info%3Aoclcnum%2F745176510&rft.isbn=978-1-938770-67-8&rft.aulast=Koerper&rft.aufirst=Henry&rft.au=Mason%2C+Roger&rft.au=Peterson%2C+Mark&rft_id=https%3A%2F%2Fwww.worldcat.org%2Foclc%2F745176510&rfr_id=info%3Asid%2Fen.wikipedia.org%3AArroyo+Trabuco" class="Z3988"></span></span> </li> <li id="cite_note-8"><span class="mw-cite-backlink"><b><a href="#cite_ref-8">^</a></b></span> <span class="reference-text">USACE, pp. 2–51</span> </li> <li id="cite_note-USACE252-9"><span class="mw-cite-backlink">^ <a href="#cite_ref-USACE252_9-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-USACE252_9-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-USACE252_9-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text">USACE, pp. 2–52</span> </li> <li id="cite_note-OCWatershedsMap-10"><span class="mw-cite-backlink">^ <a href="#cite_ref-OCWatershedsMap_10-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-OCWatershedsMap_10-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-OCWatershedsMap_10-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-OCWatershedsMap_10-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-OCWatershedsMap_10-4"><sup><i><b>e</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20071021130936/http://www.ocwatersheds.com/watersheds/sanjuan_watercourses_elevation_image1.asp">"San Juan Creek Watershed Elevation and Water Use"</a>. <i>Watershed and Coastal Resources Division of Orange County</i>. www.ocwatersheds.com. Archived from <a rel="nofollow" class="external text" href="http://www.ocwatersheds.com/watersheds/sanjuan_watercourses_elevation_image1.asp">the original</a> on 2007-10-21<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-09-19</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Watershed+and+Coastal+Resources+Division+of+Orange+County&rft.atitle=San+Juan+Creek+Watershed+Elevation+and+Water+Use&rft_id=http%3A%2F%2Fwww.ocwatersheds.com%2Fwatersheds%2Fsanjuan_watercourses_elevation_image1.asp&rfr_id=info%3Asid%2Fen.wikipedia.org%3AArroyo+Trabuco" class="Z3988"></span></span> </li> <li id="cite_note-USACE,_p._2-53-11"><span class="mw-cite-backlink">^ <a href="#cite_ref-USACE,_p._2-53_11-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-USACE,_p._2-53_11-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text">USACE, p. 2-53</span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</a></b></span> <span class="reference-text">USACE, p. 2-54</span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</a></b></span> <span class="reference-text">USACE, p. 2-55</span> </li> <li id="cite_note-14"><span class="mw-cite-backlink"><b><a href="#cite_ref-14">^</a></b></span> <span class="reference-text">USACE, p. 2.56</span> </li> <li id="cite_note-15"><span class="mw-cite-backlink"><b><a href="#cite_ref-15">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://nwis.waterdata.usgs.gov/nwis/peak?site_no=11047000&agency_cd=USGS&format=html">"Arroyo Trabuco (near San Juan Capistrano)"</a>. <i><a href="/wiki/United_States_Geological_Survey" title="United States Geological Survey">United States Geological Survey</a></i>. 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National Water Information System. 1973–2008<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-06-08</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=United+States+Geological+Survey&rft.atitle=Arroyo+Trabuco+%28At+San+Juan+Capistrano%29&rft.date=1973%2F2008&rft_id=http%3A%2F%2Fnwis.waterdata.usgs.gov%2Fnwis%2Fpeak%3Fsite_no%3D11047300%26agency_cd%3DUSGS%26format%3Dhtml&rfr_id=info%3Asid%2Fen.wikipedia.org%3AArroyo+Trabuco" class="Z3988"></span></span> </li> <li id="cite_note-17"><span class="mw-cite-backlink"><b><a href="#cite_ref-17">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20090130004901/http://www.ocwatersheds.com/watersheds/default.aspx">"Introduction to Watersheds of Orange County, California"</a>. <i>Watershed and Coastal Resources Division of Orange County</i>. www.ocwatersheds.com. Archived from <a rel="nofollow" class="external text" href="http://www.ocwatersheds.com/watersheds/default.aspx">the original</a> on 2009-01-30<span class="reference-accessdate">. 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California State University Los Angeles, Department of Geology. Archived from <a rel="nofollow" class="external text" href="http://www.calstatela.edu/dept/geology/ColburnRivers.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2010-06-02<span class="reference-accessdate">. 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Retrieved <span class="nowrap">2009-06-18</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=OC+Parks&rft.atitle=O%27Neill+Regional+Park+History&rft_id=http%3A%2F%2Fwww.ocparks.com%2FONEILLPARK%2Fdefault.asp%3FShow%3DHistory&rfr_id=info%3Asid%2Fen.wikipedia.org%3AArroyo+Trabuco" class="Z3988"></span></span> </li> </ol></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Arroyo_Trabuco&action=edit&section=13" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20071013181620/http://www.ocwatersheds.com/watersheds/sanjuan.asp">Orange County Watersheds: San Juan Creek</a></li></ul> <div class="navbox-styles"><style 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.navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Places_adjacent_to_Arroyo_Trabuco" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style 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abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Adjacent_communities" title="Template:Adjacent communities"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Adjacent_communities" title="Template talk:Adjacent communities"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Adjacent_communities" title="Special:EditPage/Template:Adjacent communities"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Places_adjacent_to_Arroyo_Trabuco" style="font-size:114%;margin:0 4em">Places adjacent to Arroyo Trabuco</div></th></tr><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><table role="presentation" style="width:100%; margin:0; text-align:center;"><tbody><tr> <td><a href="/wiki/Aliso_Creek_(Orange_County)" title="Aliso Creek (Orange County)">Aliso Creek</a></td> <td><a href="/wiki/Santiago_Creek" title="Santiago Creek">Santiago Creek</a></td> <td>Christianitos Canyon</td> </tr><tr> <td></td> <td><span typeof="mw:File"><span title="North"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/76/Pfeil_oben.svg/14px-Pfeil_oben.svg.png" decoding="async" width="14" height="17" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/76/Pfeil_oben.svg/21px-Pfeil_oben.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/76/Pfeil_oben.svg/28px-Pfeil_oben.svg.png 2x" data-file-width="500" data-file-height="600" /></span></span></td> <td></td> </tr><tr> <td style="width:33%"><a href="/wiki/Oso_Creek" title="Oso Creek">Oso Creek</a></td> <td style="width:33%;"> <div style="white-space:nowrap;"><span class="mw-valign-middle" typeof="mw:File"><span title="West"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/8/85/Pfeil_links.svg/17px-Pfeil_links.svg.png" decoding="async" width="17" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/85/Pfeil_links.svg/25px-Pfeil_links.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/85/Pfeil_links.svg/34px-Pfeil_links.svg.png 2x" data-file-width="600" data-file-height="500" /></span></span><b style="display:inline-block; vertical-align:middle; margin:0.75em 1em">Arroyo Trabuco</b><span class="mw-valign-middle" typeof="mw:File"><span title="East"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Pfeil_rechts.svg/17px-Pfeil_rechts.svg.png" decoding="async" width="17" height="14" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Pfeil_rechts.svg/25px-Pfeil_rechts.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Pfeil_rechts.svg/34px-Pfeil_rechts.svg.png 2x" data-file-width="600" data-file-height="500" /></span></span></div> </td> <td style="width:33%"></td> </tr><tr> <td></td> <td><span typeof="mw:File"><span title="South"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pfeil_unten.svg/14px-Pfeil_unten.svg.png" decoding="async" width="14" height="17" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pfeil_unten.svg/21px-Pfeil_unten.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c3/Pfeil_unten.svg/28px-Pfeil_unten.svg.png 2x" data-file-width="500" data-file-height="600" /></span></span></td> <td></td> </tr><tr> <td></td> <td><a href="/wiki/Ca%C3%B1ada_Gobernadora" title="Cañada Gobernadora">Cañada Gobernadora</a></td> <td><a href="/wiki/Bell_Canyon" title="Bell Canyon">Bell Canyon</a></td> </tr></tbody></table></div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Rivers_of_Orange_County,_California" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2" style="background:#FFD500;;background:#FFC500;"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Orange_County_major_watersheds" title="Template:Orange County major watersheds"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Orange_County_major_watersheds" title="Template talk:Orange County major watersheds"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Orange_County_major_watersheds" title="Special:EditPage/Template:Orange County major watersheds"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Rivers_of_Orange_County,_California" style="font-size:114%;margin:0 4em"><a href="/wiki/List_of_rivers_of_Orange_County,_California" title="List of rivers of Orange County, California">Rivers of Orange County, California</a></div></th></tr><tr><th scope="row" class="navbox-group" style="background:#FFD500;;width:1%"><a href="/wiki/San_Gabriel_River_(California)" title="San Gabriel River (California)">San Gabriel River</a> watershed</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Brea_Creek" title="Brea Creek">Brea Creek</a></li> <li><a href="/wiki/Coyote_Creek_(San_Gabriel_River)" class="mw-redirect" title="Coyote Creek (San Gabriel River)">Coyote Creek</a></li> <li><a href="/w/index.php?title=Carbon_Creek_(Coyote_Creek)&action=edit&redlink=1" class="new" title="Carbon Creek (Coyote Creek) (page does not exist)">Carbon Creek</a></li> <li><a href="/wiki/Fullerton_Creek" title="Fullerton Creek">Fullerton Creek</a></li> <li><a href="/w/index.php?title=Imperial_Creek&action=edit&redlink=1" class="new" title="Imperial Creek (page does not exist)">Imperial Creek</a></li> <li><a href="/w/index.php?title=Moody_Creek&action=edit&redlink=1" class="new" title="Moody Creek (page does not exist)">Moody Creek</a></li> <li><a href="/w/index.php?title=North_Fork_Coyote_Creek&action=edit&redlink=1" class="new" title="North Fork Coyote Creek (page does not exist)">North Fork Coyote Creek</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#FFD500;;width:1%"><a href="/wiki/Santa_Ana_River" title="Santa Ana River">Santa Ana River</a> watershed</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Black_Star_Canyon" title="Black Star Canyon">Black Star Canyon</a></li> <li><a href="/w/index.php?title=Blind_Canyon&action=edit&redlink=1" class="new" title="Blind Canyon (page does not exist)">Blind Canyon</a></li> <li><a href="/w/index.php?title=Fremont_Canyon_(Orange_County,_California)&action=edit&redlink=1" class="new" title="Fremont Canyon (Orange County, California) (page does not exist)">Fremont Canyon</a></li> <li><a href="/w/index.php?title=Handy_Creek&action=edit&redlink=1" class="new" title="Handy Creek (page does not exist)">Handy Creek</a></li> <li><a href="/w/index.php?title=Harding_Canyon&action=edit&redlink=1" class="new" title="Harding Canyon (page does not exist)">Harding Canyon</a></li> <li><a href="/w/index.php?title=Limestone_Canyon&action=edit&redlink=1" class="new" title="Limestone Canyon (page does not exist)">Limestone Canyon</a></li> <li><a href="/wiki/Modjeska_Canyon" class="mw-redirect" title="Modjeska Canyon">Modjeska Canyon</a></li> <li><a href="/wiki/Santiago_Creek" title="Santiago Creek">Santiago Creek</a></li> <li><a href="/wiki/Silverado_Canyon" title="Silverado Canyon">Silverado Canyon</a></li> <li><a href="/w/index.php?title=Weir_Canyon&action=edit&redlink=1" class="new" title="Weir Canyon (page does not exist)">Weir Canyon</a></li> <li><a href="/w/index.php?title=Williams_Canyon&action=edit&redlink=1" class="new" title="Williams Canyon (page does not exist)">Williams Canyon</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#FFD500;;width:1%"><a href="/wiki/Newport_Bay_(California)" title="Newport Bay (California)">Newport Bay</a> watershed</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Agua_Chinon_Creek" title="Agua Chinon Creek">Agua Chinon Creek</a></li> <li><a href="/w/index.php?title=Bee_Canyon_Creek&action=edit&redlink=1" class="new" title="Bee Canyon Creek (page does not exist)">Bee Canyon Creek</a></li> <li><a href="/w/index.php?title=Santa_Ana-Delhi_Channel&action=edit&redlink=1" class="new" title="Santa Ana-Delhi Channel (page does not exist)">Santa Ana-Delhi Channel</a></li> <li><a href="/wiki/Bonita_Creek" title="Bonita Creek">Bonita Creek</a></li> <li><a href="/w/index.php?title=Marshburn_Channel&action=edit&redlink=1" class="new" title="Marshburn Channel (page does not exist)">Marshburn Channel</a></li> <li><a href="/w/index.php?title=La_Ca%C3%B1ada_Creek&action=edit&redlink=1" class="new" title="La Cañada Creek (page does not exist)">La Cañada Creek</a></li> <li><a href="/wiki/Peters_Canyon_Wash" title="Peters Canyon Wash">Peters Canyon Wash</a></li> <li><a href="/wiki/San_Diego_Creek" title="San Diego Creek">San Diego Creek</a></li> <li><a href="/wiki/San_Joaquin_Wash" title="San Joaquin Wash">San Joaquin Wash</a></li> <li><a href="/wiki/Sand_Canyon_Wash" title="Sand Canyon Wash">Sand Canyon Wash</a></li> <li><a href="/wiki/Serrano_Creek" title="Serrano Creek">Serrano Creek</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#FFD500;;width:1%"><a href="/wiki/Aliso_Creek_(Orange_County)#Tributaries" title="Aliso Creek (Orange County)">Aliso Creek tributaries</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aliso_Creek_(Orange_County)#Tributaries" title="Aliso Creek (Orange County)">Aliso Hills Channel</a></li> <li><a href="/wiki/Dairy_Fork" class="mw-redirect" title="Dairy Fork">Dairy Fork</a></li> <li><a href="/wiki/English_Canyon_Creek" class="mw-redirect" title="English Canyon Creek">English Canyon Creek</a></li> <li><a href="/wiki/Munger_Creek" class="mw-redirect" title="Munger Creek">Munger Creek</a></li> <li><a href="/wiki/Sulphur_Creek_(California)" title="Sulphur Creek (California)">Sulphur Creek</a></li> <li><a href="/wiki/Wood_Canyon_Creek" title="Wood Canyon Creek">Wood Canyon Creek</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#FFD500;;width:1%"><a href="/wiki/San_Juan_Creek" title="San Juan Creek">San Juan Creek</a> watershed</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bell_Canyon" title="Bell Canyon">Bell Canyon</a></li> <li><a href="/wiki/Ca%C3%B1ada_Gobernadora" title="Cañada Gobernadora">Cañada Gobernadora</a></li> <li><a href="/w/index.php?title=Cold_Springs_Creek_(San_Juan_Creek)&action=edit&redlink=1" class="new" title="Cold Springs Creek (San Juan Creek) (page does not exist)">Cold Springs Creek</a></li> <li><a href="/wiki/El_Horno_Creek" title="El Horno Creek">El Horno Creek</a></li> <li><a href="/w/index.php?title=Falls_Canyon_Creek&action=edit&redlink=1" class="new" title="Falls Canyon Creek (page does not exist)">Falls Canyon Creek</a></li> <li><a href="/w/index.php?title=Hickey_Creek&action=edit&redlink=1" class="new" title="Hickey Creek (page does not exist)">Hickey Creek</a></li> <li><a href="/w/index.php?title=Holy_Jim_Creek&action=edit&redlink=1" class="new" title="Holy Jim Creek (page does not exist)">Holy Jim Creek</a></li> <li><a href="/w/index.php?title=Hot_Springs_Creek_(San_Juan_Creek)&action=edit&redlink=1" class="new" title="Hot Springs Creek (San Juan Creek) (page does not exist)">Hot Springs Creek</a></li> <li><a href="/w/index.php?title=Live_Oak_Canyon_Creek&action=edit&redlink=1" class="new" title="Live Oak Canyon Creek (page does not exist)">Live Oak Canyon Creek</a></li> <li><a href="/w/index.php?title=Lucas_Canyon_Creek&action=edit&redlink=1" class="new" title="Lucas Canyon Creek (page does not exist)">Lucas Canyon Creek</a></li> <li><a href="/wiki/Morrell_Canyon_Creek" title="Morrell Canyon Creek">Morrell Canyon Creek</a></li> <li><a href="/wiki/Oso_Creek" title="Oso Creek">Oso Creek</a></li> <li><a href="/wiki/Tijeras_Canyon_Creek" title="Tijeras Canyon Creek">Tijeras Canyon Creek</a></li> <li><a class="mw-selflink selflink">Arroyo Trabuco</a></li> <li><a href="/wiki/Trampas_Canyon" title="Trampas Canyon">Trampas Canyon</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="background:#FFD500;;width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/w/index.php?title=Bolsa_Chica_Channel&action=edit&redlink=1" class="new" title="Bolsa Chica Channel (page does not exist)">Bolsa Chica Channel</a></li> <li><a href="/w/index.php?title=Buck_Gully&action=edit&redlink=1" class="new" title="Buck Gully (page does not exist)">Buck Gully</a></li> <li><a href="/w/index.php?title=Muddy_Creek_(Orange_County)&action=edit&redlink=1" class="new" title="Muddy Creek (Orange County) (page does not exist)">Muddy Creek</a></li> <li><a href="/w/index.php?title=Prima_Deshecha_Ca%C3%B1ada&action=edit&redlink=1" class="new" title="Prima Deshecha Cañada (page does not exist)">Prima Deshecha Cañada</a></li> <li><a href="/wiki/Salt_Creek_(Orange_County)" title="Salt Creek (Orange County)">Salt Creek</a></li> <li><a href="/w/index.php?title=Segunda_Deshecha_Ca%C3%B1ada&action=edit&redlink=1" class="new" title="Segunda Deshecha Cañada (page does not exist)">Segunda Deshecha Cañada</a></li> <li><a href="/w/index.php?title=Talbert_Channel&action=edit&redlink=1" class="new" title="Talbert Channel (page does not exist)">Talbert Channel</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; 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