Silverwood Lake

Silverwood Lake
Name	Silverwood Lake
Location	San Bernardino County, California, United States
Type	Reservoir
Inflow	California Aqueduct, West Fork Mojave River
Outflow	West Fork Mojave River, California Aqueduct
Catchment	San Bernardino Mountains
Basin countries	United States
Area	982 acres
Max-depth	180 ft
Elevation	1,550 ft

Silverwood Lake Silverwood Lake is a reservoir in San Bernardino County, California created by the construction of a dam on the West Fork Mojave River. It forms part of the California State Water Project and lies within the San Bernardino National Forest near the communities of Hesperia, California, Lake Arrowhead, California, and Victorville, California. The impoundment supports multiple uses including water supply, flood control, recreation, and habitat for native and introduced species.

History

The reservoir was constructed in the late 1960s and early 1970s as part of the California State Water Project and the California Aqueduct infrastructure, following planning that involved agencies such as the California Department of Water Resources and the U.S. Bureau of Reclamation. Construction intersected with regional development in San Bernardino County, California and was contemporaneous with projects like Perris Dam and expansions to the Metropolitan Water District of Southern California delivery network. The impoundment inundated portions of historical routes used by Mojave people and early Spanish missions in California era travel corridors. During the reservoir’s inauguration, officials from the California Department of Fish and Wildlife and representatives of the State Water Contractors highlighted its anticipated role in drought resilience for southern Los Angeles County, California and Orange County, California.

Geography and Hydrology

Situated in the foothills of the San Bernardino Mountains, the lake receives flow from the West Fork Mojave River and from imported water conveyed by the California Aqueduct. The reservoir lies within the Mojave Desert ecotone and drains to downstream reaches managed under the Mojave River watershed planning. Silverwood Lake’s hydrology is influenced by seasonal precipitation patterns associated with the Pacific Storm Track and by diversions coordinated through facilities such as Castaic Dam, Pyramid Lake (California), and the East Branch Extension (State Water Project). The site’s geology includes formations related to the San Andreas Fault system and adjacent ranges like the San Gabriel Mountains and Little San Bernardino Mountains. Water levels respond to operations set by the California Department of Water Resources and the Metropolitan Water District of Southern California under regulatory frameworks influenced by the California Environmental Quality Act and state water rights adjudications such as decisions following the City of Los Angeles v. San Fernando era.

Ecology and Wildlife

The reservoir and surrounding San Bernardino National Forest support assemblages of species typical of the Mojave Desert–montane interface, including riparian corridors used by the Southwestern Willow Flycatcher and migratory birds on the Pacific Flyway. Aquatic populations include introduced game fish managed by the California Department of Fish and Wildlife and angling organizations like the California Sportfishing Protection Alliance. Terrestrial fauna in adjacent chaparral and pine-oak habitats feature bighorn sheep and California quail, along with predators such as mountain lion and coyote. Vegetation communities include riparian willow and cottonwood stands, chaparral species like Ceanothus and Manzanita, and mixed-conifer at higher elevations similar to stands in the Angeles National Forest. Invasive species pressures mirror those documented in Mono Lake and other California reservoirs, prompting monitoring programs linked to agencies including the U.S. Fish and Wildlife Service.

Recreation and Facilities

The reservoir is operated with public recreation in mind and includes facilities administered by the California Department of Parks and Recreation and regional park districts. Boating, camping, hiking, and angling draw visitors from Los Angeles, San Diego, and Riverside County. Nearby trailheads connect to routes used by enthusiasts familiar with destinations like Mount Baldy (California), Big Bear Lake, and Lake Arrowhead. Infrastructure includes boat ramps, campgrounds, picnic areas, and interpretive signage comparable to amenities at Castaic Lake State Recreation Area and Lake Perris State Recreation Area. Law enforcement and rescue services are coordinated with the San Bernardino County Sheriff’s Department and California Highway Patrol on nearby highways such as Interstate 15 (California) and State Route 138 (California).

Water Management and Infrastructure

Silverwood Lake functions as a forebay and storage component of the California State Water Project, integrated with pumping plants, aqueducts, and conveyance tunnels like the Mojave Siphon and facilities associated with the Edmonston Pumping Plant. Operations are coordinated with agencies including the California Department of Water Resources, the Metropolitan Water District of Southern California, and local entities such as the Victor Valley Water District. Water quality monitoring follows standards influenced by the California Regional Water Quality Control Board and federal statutes administered by the U.S. Environmental Protection Agency. Emergency response and dam safety conform to guidelines from the Federal Energy Regulatory Commission and the U.S. Army Corps of Engineers where applicable to reservoir infrastructure.

Environmental Issues and Conservation

Conservation and environmental challenges at the reservoir include algal blooms and eutrophication concerns similar to issues at Lake Tahoe and Folsom Lake, invasive species management comparable to strategies used at Lake Shasta, and wildfire impacts analogous to events in the San Gabriel Mountains National Monument. Collaborative conservation efforts involve the California Department of Fish and Wildlife, U.S. Forest Service, and local non-governmental organizations such as The Nature Conservancy and regional watershed councils. Restoration projects focus on riparian habitat enhancement, sediment management, and public education campaigns modeled after programs at Santa Monica Mountains National Recreation Area and the Los Angeles River revitalization initiatives. Policy dialogues around reservoir operations feature stakeholders including municipal utilities like the City of Los Angeles Department of Water and Power and regional planning bodies such as the Southern California Association of Governments.

Category:Lakes of San Bernardino County, California Category:Reservoirs in California