Briones Reservoir


Briones Reservoir is an open cut terminal water storage reservoir located in western Contra Costa County, in the East Bay region of the San Francisco Bay Area, California.
It is owned and operated by the East Bay Municipal Utility District.

Geography

The reservoir is in the Briones Hills, on the west side of Briones Regional Park and northeast of Orinda. It is impounded by Briones Dam, an earthen dam completed in 1964. The reservoir is the largest of EBMUD’s five East Bay terminal reservoirs, with a total capacity of, and it has a total watershed of 8.59 square miles.
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Recreation

Because the water in the reservoir is mainly for human potable water uses, EBMUD is very strict about recreational activities. Fishing, swimming, and wading are not allowed. However, college rowing teams from Mills College, UC Berkeley and Saint Mary's College have permission to use the lake under certain rules, such as the inspection of all boats before use on the lake in order to prevent contamination.
Two trails, the Bear Creek Trail and the Oursan Trail, together form a 14-mile hiking trail loop that circumnavigates the reservoir. The trailhead is at the Bear Creek Staging Area, which is within Briones Regional Park. A Trail Use Permit issued by EBMUD is required for all hikers, which can be obtained online at the EBMUD website for $10. No mountain biking is permitted on the trail. Horseback riding is allowed. Dogs are allowed on the Oursan Trail segment only, and must be leashed.

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