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Trampas Canyon

From Wikipedia, the free encyclopedia

Trampas Canyon Creek
San Juan Creek Watershed map.jpg
Stream map of San Juan Creek watershed with three major tributaries in dark blue, smaller streams in light blue, and cities and towns in orange. Trampas Canyon Creek is the short waterway flowing north into San Juan Creek, near the lower edge of the map.
CountryUnited States
DistrictOrange County
Physical characteristics
SourceTrampas Canyon Reservoir near Santa Ana Mountains
 • coordinates33°29′18″N 117°35′36″W / 33.4883597°N 117.5933813°W / 33.4883597; -117.5933813
 • elevation800 ft (240 m)
MouthSan Juan Creek
 • coordinates
33°30′53″N 117°34′58″W / 33.5147478°N 117.5828254°W / 33.5147478; -117.5828254
 • elevation
272 ft (83 m)
Length0.8 mi (1.3 km)
Basin features
River systemSan Juan Creek

Trampas Canyon is a short tributary of San Juan Creek in southern Orange County the U.S. state of California.[1] It rises in forks on steep slopes of the southern Santa Ana Mountains (33°29′18″N 117°35′36″W / 33.4883597°N 117.5933813°W / 33.4883597; -117.5933813), and flows north to where it is dammed by Trampas Canyon Dam (USGS San Clemente Quad 7½"). Trampas Canyon 1795-006 Dam (33°29′54″N 117°35′15″W / 33.498359°N 117.587548°W / 33.498359; -117.587548)[2] forms a small lake that branches into four forks running east–west. Exiting the dam, the creek flows north and turns slightly to the west, where it joins San Juan Creek on the left bank, near the confluence of Cañada Gobernadora (33°18′19″N 117°20′45″W / 33.3053°N 117.3458°W / 33.3053; -117.3458). Trampas Canyon Creek is ephemeral and only flows during storm events or while Trampas Canyon Dam is releasing, and is not a primary tributary of San Juan Creek.[3]

A study was prepared in 1999 by the City of San Juan Capistrano, and it was found that a failure of the earthen Trampas Canyon Dam would do more damage to the lower course of San Juan Creek than for a 100 year flood. A failure would cause a floodwave over 0.5 miles (0.80 km) wide to rush down the lower 4.7 miles (7.6 km) of San Juan Creek to Doheny State Beach, flooding parts of San Juan Capistrano and Dana Point. A 100-year flood would cause a slightly smaller inundation.[4]


Map all coordinates using: OpenStreetMap 
Download coordinates as: KML · GPX
  1. ^ "Trampas Canyon". Geographic Names Information System. United States Geological Survey. Retrieved 2009-06-15.
  2. ^ "Trampas Canyon 1795-006 Dam". Geographic Names Information System. United States Geological Survey. Retrieved 2009-06-15.
  3. ^ "San Juan Creek Watershed Management Study: Feasibility Phase" (PDF). U.S. Army Corps of Engineers. August 2002. Archived from the original (PDF) on 2006-03-13. Retrieved 2009-06-16.
  4. ^ Technical Background Report, General Plan Update - City of San Juan Capistrano, August 1999

External links

This page was last edited on 10 January 2020, at 19:16
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