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Upper San Leandro Reservoir is an artificial lake in Alameda County and Contra Costa County, California which provides water for the East Bay Municipal Utility District (EBMUD). It is impounded by the earth-filled San Leandro Dam on San Leandro Creek, located at the southeast end of the lake.
Although it receives some runoff from its local watershed, most of the water is imported via the Mokelumne Aqueduct. The reservoir has a capacity of about , though its normal volume is about . The reservoir name includes "Upper" to distinguish it from Lake Chabot, several miles downstream, which was originally known as "Lower San Leandro Reservoir".
A new earth-filled dam was constructed in 1977, directly downstream of the old one, to provide protection against earthquakes. The new dam is high and long, containing of material.
Tributaries that flow into the lake include San Leandro, Moraga, King Canyon, Kaiser, Buckhorn and Redwood Creeks. The reservoir and its feeder streams have a population of landlocked
Original dam
The reservoir was originally formed in 1926 when the first San Leandro Dam was completed, and it was first filled by the Mokelumne Aqueduct in 1929. It inundated a long section of the San Leandro Creek valley, including the towns of Valle Vista and Redwood. The original dam was constructed between 1924 and 1926 using thehydraulic fill
Hydraulic fill is a means of selectively emplacing soil or other materials using a stream of water. It is also a term used to describe the materials thus emplaced. Gravity, coupled with velocity control, is used to effect the selected depositi ...
method and was considered seismically inadequate.
New dam
A new earth-filled dam was constructed in 1977, directly downstream of the old one, to provide protection against earthquakes. The new dam is high and long, containing of material.
Tributaries that flow into the lake include San Leandro, Moraga, King Canyon, Kaiser, Buckhorn and Redwood Creeks. The reservoir and its feeder streams have a population of landlocked rainbow trout
The rainbow trout (''Oncorhynchus mykiss'') is a species of trout native to cold-water tributaries of the Pacific Ocean in Asia and North America. The steelhead (sometimes called "steelhead trout") is an anadromous (sea-run) form of the coasta ...
whose migration to San Francisco Bay was blocked by the dam.
The reservoir is closed to boating and fishing, in order to protect water quality. However, there is a public trail system surrounding the lake.
See also
*List of dams and reservoirs in California
Following is a list of dams and reservoirs in California in a sortable table. There are over 1,400 named dams and 1,300 named reservoirs in the state of California.
Dams in service
:''Please add to this list from the below sources.''
Former ...
References
{{reflist, 30em External linksUpper San Leandro Reservoir
engineering details
Reservoirs in Alameda County, California
Reservoirs in Contra Costa County, California
1926 establishments in California
East Bay Municipal Utility District