Bollinger Canyon Creek
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| Bollinger Canyon Creek Bollinger Creek | |
|---|---|
 Upper Bollinger Canyon Creek shaded by mature California Bay and Coast live oak in Las Trampas Regional Wilderness (December 19th, 2021) | |
| Location | |
| Country | United States |
| State | California |
| Region | Bay Area |
| District | Contra Costa County |
| Physical characteristics | |
| Mouth | San Ramon Creek |
| Length | 6.72 miles[1] |
| Basin features | |
| River system | Walnut Creek Watershed |
| Cities | San Ramon, CA |
Bollinger Canyon Creek is an approximately 6.72 mile long (10.8 km)[2][3] stream in Contra Costa County, California in the San Francisco Bay Area. It is a tributary of San Ramon Creek which is part of the Walnut Creek watershed.
Course
Bollinger Canyon Creek begins as a number of ephemeral streams emitting from a horst valley, Bollinger Canyon, in the highest reaches of the Berkeley Hills, in California's Inner Coast Ranges.
The highest point in the drainage is around 2,000 feet above sea level.[3] From a low divide which separates it with Las Trampas Creek, it runs southward through Bollinger Canyon, gradually descending in altitude until turning sharply to the east near Crow Canyon Road in San Ramon, California. Shortly after, it is confined to concrete channels and it joins with San Ramon Creek near the city's downtown.[4]
Geography
Bollinger Creek exhibits a character similar to many other streams in Central California. It is vegetated with California mixed evergreen forest, chaparral and open grasslands, habitats typical of the East Bay region. Many of its tributaries only carry water during storms.
The region surrounding the creek has a cool-summer mediterranean climate which generally keeps temperatures mild[5]. Due to its proximity to the Pacific Ocean, the creek and its watershed are often inundated with fog.
Virtually the entirety of the creek's course upstream from San Ramon, California is undeveloped, with ranching and open space making up the majority of land use.[3]
Much of the land in the watershed is forested and rugged, providing habitat for a variety of wildlife species. Black-tailed deer, Coyote and boar are seen regularly.
Bollinger Creek's headwaters lie in EBRPD's Las Trampas Regional Wilderness, which is a popular area among locals for hiking, biking, birding and geology. The park features a number of hiking and biking paths that traverse Bollinger Canyon, Rocky Ridge and Las Trampas Ridge.
The porous formations of Briones Sandstone that comprise the canyon walls trap rainfall and aid the formation of the numerous springs that feed the creek.[6]
References
- ^ "Contra Costa County Creeks Inventory" (PDF). www.cccleanwater.org. 2004. Retrieved 11/22/23.
{{cite web}}: Check date values in:|access-date=(help) - ^ "Contra Costa County Creeks Inventory" (PDF). www.cccleanwater.org. 2004. Retrieved 11/22/23.
{{cite web}}: Check date values in:|access-date=(help) - ^ a b c "Contra Costa County Watershed Atlas" (PDF). www.cccleanwater.org. Contra Costa County Public Works Department. 2004.
- ^ Leidy, Robert A. (2005). "Historical Distribution and Current Status of Steelhead/Rainbow Trout (Oncorhynchus mykiss) in Streams of the San Francisco Estuary, California" (PDF). Retrieved 11/22/23.
{{cite web}}: Check date values in:|access-date=(help) - ^ "Mean Seasonal Isohyets compiled from precipitation records". www.contracosta.ca.gov. 1977.
- ^ Knight, Walter (1978). "The Story of Las Trampas" (PDF). www.ebparks.org. Retrieved 11/22/23.
{{cite web}}: Check date values in:|access-date=(help)