Little Rock Reservoir is a man-made reservoir located in the San Gabriel Mountains of California. Constructed in 1956, the reservoir is fed by runoff from nearby mountains and snowpack during the winter. The reservoir has a capacity of 19,200 acre-feet and serves as a vital source of water for the surrounding communities, including the cities of Palmdale and Lancaster. The surface flow is provided by the Little Rock Creek, which is a tributary of the Mojave River. The snowpack providers include the San Gabriel Mountains and the surrounding areas. Little Rock Reservoir also supports agricultural activities in the surrounding area, including irrigating crops such as grapes, almonds, and pistachios. Recreational activities, such as hiking and fishing, are also popular in the area.