Jewel Lake is a former reservoir

Reservoir

A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...

 and artificual lake along Wildcat Creek

Wildcat Creek (California)

Wildcat Creek is a creek which flows through Wildcat Canyon situated between the Berkeley Hills and the San Pablo Ridge, emptying into San Pablo Bay in northern California. The creek originates in Tilden Regional Park just east of the city of Berkeley. It feeds the artificial Lake Anza as well as...

, a small stream

Stream

A stream is a body of water with a current, confined within a bed and stream banks. Depending on its locale or certain characteristics, a stream may be referred to as a branch, brook, beck, burn, creek, "crick", gill , kill, lick, rill, river, syke, bayou, rivulet, streamage, wash, run or...

 in Northern California

Northern California

Northern California is the northern portion of the U.S. state of California. The San Francisco Bay Area , and Sacramento as well as its metropolitan area are the main population centers...

 in Tilden Regional Park

Tilden Regional Park

Tilden Regional Park, also known as "Tilden" , is a regional park in the East Bay, part of the San Francisco Bay Area in California. It is situated between the Berkeley Hills and San Pablo Ridge....

. It is located in the Wildcat Canyon

Wildcat Canyon

Wildcat Canyon is a narrow linear valley just east of the Berkeley Hills in the San Francisco Bay Area, situated in Contra Costa County, California. The canyon is bounded on its east side by the San Pablo Ridge, and is drained by Wildcat Creek which runs northwest to its outlet in San Pablo Bay. ...

 between the Berkeley Hills

Berkeley Hills

The Berkeley Hills are a range of the Pacific Coast Ranges that overlook the northeast side of the valley that surrounds San Francisco Bay. They were previously called the "Contra Costa Range/Hills" , but with the establishment of Berkeley and the University of California, the current usage was...

 and Sobrante Ridge Hills in an unincorporated area closest to Richmond

Richmond, California

Richmond is a city in western Contra Costa County, California, United States. The city was incorporated on August 7, 1905. It is located in the East Bay, part of the San Francisco Bay Area. It is a residential inner suburb of San Francisco, as well as the site of heavy industry, which has been...

 and Kensington, California

Kensington, California

Kensington is an unincorporated community and census-designated place located in the East Bay, part of the San Francisco Bay Area, in Contra Costa County, California, United States. The population was 5,077 at the 2010 census.- Law and government :Kensington is an unincorporated area of Contra...

 geographically and Berkeley

Berkeley, California

Berkeley is a city on the east shore of the San Francisco Bay in Northern California, United States. Its neighbors to the south are the cities of Oakland and Emeryville. To the north is the city of Albany and the unincorporated community of Kensington...

accessibly. A wooden raised walkway built in the 1970s runs over marshland to the south of the lake. The dam and abandoned flood control machinery are visible at the north end of the lake.

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