Silverwood Lake is owned and operated by the State of California and is operated by the state's Department of Water Resources. Although it is also used for recreational activities, it was constructed in 1971 as a regulating reservoir along the East Branch of the State Water Project. Water is siphoned into the lake from the aqueduct's terminus in Hesperia and then travels primarily south, where it is used to meet water demand in the San Bernardino and Inland Empire areas. MWA takes deliveries of SWP water from the lake through the Cedar Springs Dam, which has an outlet into the Mojave River. Occasionally, surface drainage from precipitation in the San Bernardino Mountains enters the lake, when this occurs an equal volume is released from the lake within a short time to maintain natural flows in the Mojave River.