Red Bluff Diversion Dam

Red Bluff Diversion Dam
Name	Red Bluff Diversion Dam
Location map	California
Country	United States
Location	Tehama County, California
Status	Removed (2013–2016 demolition project)
Opening	1964
Owner	United States Bureau of Reclamation
Dam type	Concrete diversion dam (removed)
River	Sacramento River

Red Bluff Diversion Dam was a concrete diversion structure on the Sacramento River near Red Bluff in Tehama County. Built in the early 1960s by the Bureau of Reclamation as part of Central Valley and Central Valley Project water infrastructure, it diverted water into the Tehama-Colusa Canal for irrigation and municipal use. The facility became the focus of contentious debates involving the California Department of Fish and Wildlife, National Marine Fisheries Service, tribal governments such as the Yurok people and Wintu, environmental organizations including Sierra Club and Natural Resources Defense Council, and agricultural stakeholders represented by the Westlands Water District and local irrigation districts.

History

Construction began amid post‑war expansion and federal projects like the Central Valley Project and the Bureau of Reclamation’s mid‑20th century program. The dam opened in 1964 to supply the Tehama-Colusa Canal linked to Colusa County farmlands and urban centers including Sacramento. From the 1970s onward, litigation and regulatory actions under statutes such as the Endangered Species Act of 1973 and the Clean Water Act intensified disputes over impacts to federally listed species like the Central Valley spring-run Chinook salmon and Sacramento River winter-run Chinook salmon. Tribal claims invoking the California v. United States water rights precedents and settling of water rights under frameworks influenced negotiations. By the 2000s, biological opinions issued by National Marine Fisheries Service and measures by the U.S. Fish and Wildlife Service led to operational changes, culminating in the decision to remove barriers and modify diversion operations. Demolition and bypass projects were implemented to improve fish passage and restore river connectivity.

Design and Structure

The facility was a low‑head concrete diversion dam with gated spillways, radial gates, and headworks feeding the Tehama-Colusa Canal. Its engineering reflected mid‑century designs used throughout the Central Valley Project infrastructure, comparable in type to diversion structures managed by the Bureau of Reclamation on the American River and Feather River. Structural components included concrete piers, training walls, fish ladders attempts modeled after systems promoted by the U.S. Army Corps of Engineers and retrofits guided by recommendations from the California Department of Fish and Wildlife. Hydraulics engineering analyses referenced standards from organizations such as the American Society of Civil Engineers and operational criteria aligned with the National Environmental Policy Act compliance documents prepared by federal agencies. Flood management coordination occurred with Federal Emergency Management Agency mapping and county levee districts.

Operation and Water Management

Operational control was coordinated among federal, state, and local entities: the Bureau of Reclamation set diversion schedules, the California Department of Water Resources and local irrigation districts managed deliveries, and municipal suppliers in Sacramento region negotiated water allocations. Water rights frameworks including riparian and appropriative doctrines shaped allocations alongside decisions influenced by Central Valley Project Improvement Act provisions. Seasonal operations responded to hydrologic inputs from the Sierra Nevada, snowpack forecasts from the DWR, and coordination with the U.S. Geological Survey river gage network. Adaptive management incorporated recommendations from scientific bodies such as the Scientific Advisory Board (California) and fisheries agencies to reduce entrainment of anadromous fish, adjust bypass flows, and implement pulse flows during migration periods.

Environmental and Ecological Impacts

The dam’s presence altered longitudinal connectivity on the Sacramento River, affecting anadromous species including Chinook salmon and steelhead. Ecological effects included changes to sediment transport similar to observations at other Lower Sacramento River structures studied by the University of California, Davis and California State University, Chico. Conservation concerns mobilized regional chapters of groups such as the Sierra Club and scientific assessments from institutions like the California Department of Fish and Wildlife and federal agencies. Restoration initiatives following removal focused on reestablishing spawning substrate, riparian vegetation projects aligned with California Native Plant Society guidance, and coordination with tribal fisheries programs from the Wintu and Yurok people. Monitoring programs used protocols from the U.S. Fish and Wildlife Service and academic partners to assess recovery of Central Valley salmonids and native aquatic invertebrates.

Legal and Regulatory Issues

Legal disputes involved federal statutes and administrative processes including the Endangered Species Act of 1973, National Environmental Policy Act, and water rights adjudications influenced by cases in California courts and federal district courts. Agencies such as the National Marine Fisheries Service and the U.S. Fish and Wildlife Service issued biological opinions that imposed operational constraints. Litigation and negotiated settlements featured stakeholders like the Natural Resources Defense Council, agricultural districts, and tribal governments invoking treaty and aboriginal fishing rights examined under precedents like United States v. Winans and state water law doctrines. Regulatory compliance required permits under the Clean Water Act Section 404 overseen by the U.S. Army Corps of Engineers and state water quality certifications from the California State Water Resources Control Board.

Recreation and Local Economy

Before removal, the dam and canal shaped regional recreation and economy by supporting irrigated agriculture in Colusa County and Glenn County and by influencing recreational fishing, boating, and local tourism connected to Red Bluff events. Economic impacts were analyzed by county planning agencies and academic economists at institutions such as the University of California, with trade groups like the California Farm Bureau Federation representing affected agricultural interests. Post‑removal, restoration projects created construction jobs overseen by contractors and federal contractors, while recreation planners from local parks departments and the California Department of Parks and Recreation incorporated enhanced river access, angling opportunities for returning Chinook salmon, and riparian trail development coordinated with municipal governments.

Category:Dams in California Category:Sacramento River