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Bollinger Canyon Creek is an approximately 6.72 mile long (10.8 km)[1] 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.
| 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 | ~6.76 miles |
| Basin features | |
| River system | Walnut Creek Watershed |
| Cities | San Ramon, CA |
Course
Bollinger Canyon Creek begins as a number of ephemeral streams emitting from a canyon in the highest reaches of the Berkeley Hills, in Contra Costa County, California. Many of its tributaries do not have water during the dry season.
The highest point in the drainage is around 2,000 feet above sea level. From a low divide which separates it with Las Trampas Creek, it runs southward through Bollinger Canyon, gradually descending in altitude until abruptly turning 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.
Geography
Bollinger Creek exhibits a character similar to many other streams in Central California. The region surrounding the creek has a cool-summer mediterranean climate which generally keeps temperatures mild[2]. 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. Bollinger Creek's headwaters lie in the Las Trampas Regional Wilderness, which is a popular area among locals for hiking, biking, birding and geology.
- ^ "Contra Costa County Watershed Atlas" (PDF). www.cccleanwater.org. Contra Costa County Public Works Department. 2004.
- ^ "Mean Seasonal Isohyets compiled from precipitation records". www.contracosta.ca.gov. 1977.