Bollinger Canyon Creek

Bollinger Canyon Creek is an 6.72 mile long (10.8 km) 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 that emit from steep gulches in the high north–south trending valley formed between Rocky Ridge and Las Trampas Ridge in the Berkeley Hills near the city of San Ramon, California. 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.

One of the many small tributaries flowing out of the walls of Bollinger Canyon into Bollinger Creek. Many only have water on the surface for short periods. (December 19th, 2021)

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  Fog rolling up Bollinger Canyon to the divide between Bollinger Creek and Las Trampas Creek (December 19, 2021)
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  A healthy stretch of Bollinger Creek flanked by California mixed evergreen forest (December 19, 2021)