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{{Short description|Creek in Central California}}
{{Infobox river
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| source_country =
| mouth = [[San Ramon Creek]]
| mouth_coordinates = {{coord|37.77085|-121.98988|format=dms|type:river_region:US-CA|display=inline,title}}
| mouth_country =
| discharge_location =
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| discharge_round =
| website =
| river_system = [[Walnut Creek
}}
'''Bollinger Canyon Creek''' is an approximately 6.72
== Course ==
Bollinger Canyon Creek begins as a number of [[ephemeral stream]]s emitting from a [[Horst (geology)|horst]] valley, Bollinger Canyon, in the highest reaches of the [[Berkeley Hills]], in California's [[Inner Coast Ranges]].<ref name=":1" />
The highest point in the drainage is around 2,000 feet above sea level.<ref name=":0" /> 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
== 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.[[File:Bollinger Canyon Creek Tributary.jpg|thumb|One of the many small tributaries flowing out of the walls of Bollinger Canyon into Bollinger Creek. (December 19th, 2021)|left]]
The region surrounding the creek has a [[cool-summer mediterranean]] climate which generally keeps temperatures mild.<ref>{{Cite web |date=1977 |title=Mean Seasonal Isohyets compiled from precipitation records |url=https://www.contracosta.ca.gov/DocumentCenter/View/770/CCCo-Isohyet-Map-Low-Color-PDF?bidId= |website=www.contracosta.ca.gov}}</ref>
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.<ref name=":0" />
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A wide variety of raptors, among them [[Red-shouldered hawk|Red-shouldered hawks]] and [[Great horned owl|Great horned owls]] reside in the watershed, particularly on the steep rock outcrops on Las Trampas Ridge, as well as [[Turkey vulture|turkey vultures]].<ref name=":4" />
=== Trout Population ===
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.<ref name=":2" />
== References ==
{{reflist}}
[[Category:Rivers of California]]
[[Category:Contra Costa County, California]]
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