Bollinger Canyon Creek

Bollinger Canyon Creek is an approximately 6.72-mile-long (10.8 km)[2][3] stream in Contra Costa County, California[4] in the San Francisco Bay Area.

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] 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.

[8] A wide variety of raptors, among them Red-shouldered hawks and Great horned owls reside in the watershed, particularly on the steep rock outcrops on Las Trampas Ridge, as well as turkey vultures.

[8] Bollinger Canyon Creek is unique in that it retains a population of Coastal rainbow trout which have been extirpated from much of the San Francisco Bay watershed through development and the installation of migration barriers like dams.

One of the many small tributaries flowing out of the walls of Bollinger Canyon into Bollinger Creek. (December 19th, 2021)
A fog bank creeping up to the divide between Las Trampas Creek and Bollinger Creek, with Rocky Ridge in the background (December, 19th, 2021)
Late spring in Bollinger Canyon from Rocky Ridge ; Bollinger Creek runs through a belt of oak and laurel trees with Las Trampas Ridge and Mount Diablo in the background. (May 24th, 2022)