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| Cache Creek Dam (Indian Valley Dam) | |
|---|---|
| Name | Cache Creek Dam (Indian Valley Dam) |
| Location | Lake County, California, Mendocino County, California |
| Coordinates | 39°01′N 122°56′W |
| Status | Operational |
| Opened | 1975 |
| Owner | United States Bureau of Reclamation |
| Type | Earthfill |
| Height | 151 ft |
| Length | 1,950 ft |
| Reservoir | Indian Valley Reservoir |
| Capacity | 125,000 acre-feet |
Cache Creek Dam (Indian Valley Dam) is a major earthfill impoundment on a tributary of Cache Creek in northern California. Constructed in the 1970s as part of regional water resources initiatives, the facility created Indian Valley Reservoir to provide water supply, flood control, and recreation for communities in Lake County, California, Yolo County, California, and surrounding counties. The dam is operated under federal oversight and interacts with multiple state and local agencies concerning water rights, environmental compliance, and land use.
The dam lies within the watershed that drains to Clear Lake (California), connecting hydrologically to the Sacramento River Basin via Cache Creek. Ownership and operational responsibilities involve the United States Bureau of Reclamation and local water districts such as the Yolo County Flood Control and Water Conservation District and regional reclamation entities. The structure was conceived amid post‑World War II infrastructure programs influenced by agencies like the U.S. Army Corps of Engineers and state initiatives led by the California Department of Water Resources. Its multipurpose mission includes municipal and industrial supply, irrigation support for Yolo County, limited flood attenuation, and enhancement of recreational assets linked to regional parks and reservoirs.
Planning for the dam traces to mid‑20th century water development discussions involving Lake County, Yolo County, and state planners affiliated with the California State Water Resources Control Board. Feasibility studies involved consultants and federal engineering teams with precedents in projects like Shasta Dam and Folsom Dam influencing design philosophy. Construction began in the late 1960s and proceeded through the early 1970s with contractors experienced in earthen dam construction who had worked on projects associated with the Bureau of Reclamation and state water programs. The project advanced amid debates with environmental stakeholders, including advocacy by groups connected to Sierra Club chapters and local conservation organizations, and regulatory review by the U.S. Fish and Wildlife Service and state agencies.
The earthen embankment is approximately 151 feet high and nearly 1,950 feet long, founded on bedrock and engineered with zoned fill and internal drainage features informed by precedents such as the Aswan High Dam in terms of seepage control methods (though at vastly different scale). Key structural elements include a reinforced spillway, outlet works, and an emergency overflow channel; hydraulic components were designed to meet criteria similar to standards applied at Pardee Dam and other Reclamation projects. Geotechnical investigations referenced regional formations described in studies pertaining to the Coast Ranges (California) and seismic assessments guided by protocols from the United States Geological Survey and state seismic safety programs. The dam includes monitoring instrumentation comparable to networks used at Oroville Dam for settlement, piezometers, and seepage measurement.
Indian Valley Reservoir created by the dam serves as a water storage facility with gross capacity on the order of 125,000 acre‑feet, subservient to seasonal runoff patterns influenced by Mediterranean climate cycles documented by National Oceanic and Atmospheric Administration climate data. The reservoir inundated valley lands historically used for grazing and timber, with cultural landscapes noted in records from Pomo peoples and local historical societies. Its surface area and shoreline conditions change with interannual variability and droughts tracked alongside statewide water allocations administered under frameworks like the California Water Code and regional water rights adjudications.
Operations balance municipal, industrial, irrigation, and environmental flow objectives coordinated through agreements among the United States Bureau of Reclamation, county water districts, and state agencies such as the California Department of Fish and Wildlife. Releases are managed to support downstream rights holders in Yolo County and to contribute to flows in Cache Creek that affect fisheries and riparian habitats recognized under listings by the National Marine Fisheries Service where applicable. Water accounting, allocation, and emergency response plans reference state emergency operations modeled after protocols used by the California Office of Emergency Services and interagency coordination frameworks exemplified in other regional projects.
The impoundment altered physical and ecological processes in the watershed, affecting native fish populations including species related to listings under the California Endangered Species Act and federally under programs administered by the U.S. Fish and Wildlife Service and National Marine Fisheries Service. Reservoir operations influence temperature regimes, sediment transport, and riparian connectivity with consequences studied by researchers affiliated with institutions like the University of California, Davis and the California Department of Fish and Wildlife. Mitigation and monitoring efforts have involved collaboration with nonprofit conservation groups, tribal governments such as representatives of Pomo tribes, and state regulatory bodies to address habitat restoration, fish passage, and water quality standards enforced by the State Water Resources Control Board.
Indian Valley Reservoir supports public recreation including boating, angling, camping, and wildlife observation, with facilities managed in part by county parks and local recreation districts similar to arrangements at reservoirs like Clear Lake and Lake Berryessa. Recreational use is subject to permits, seasonal restrictions, and safety advisories coordinated with agencies such as the California Department of Parks and Recreation and county sheriff offices. Visitor services, interpretive programs, and volunteer initiatives often engage local historical societies and outdoor groups to promote stewardship and public education.
Category:Dams in California Category:Reservoirs in Lake County, California Category:United States Bureau of Reclamation dams