New Bullards Bar Dam

New Bullards Bar Dam
Name	New Bullards Bar Dam
Location	Yuba County, California, United States
Country	United States
Status	Operational
Construction began	1961
Opening	1969
Owner	Yuba County Water Agency
Dam type	Concrete arch
Dam height	645ft
Dam length	1,000ft
Reservoir	New Bullards Bar Reservoir (Yuba River tributary)
Reservoir capacity total	969000acre.ft
Plant capacity	340MW

New Bullards Bar Dam is a large concrete arch dam on the North Yuba River in Yuba County, California, United States. Completed in 1969 by the Yuba County Water Agency, the dam created New Bullards Bar Reservoir and serves multiple purposes including flood control, hydroelectric power, irrigation storage, and recreation. It is notable for its height, arch design, and integration with regional water projects and power grids.

History

The project emerged from mid-20th-century planning involving agencies such as the Yuba County Water Agency, the U.S. Army Corps of Engineers, and the California Department of Water Resources, and was influenced by earlier developments like the original Bullards Bar project near the town of Smartville, California. Federal and state water policy debates during the eras of the Bureau of Reclamation and the Central Valley Project shaped funding and authorization. Local leaders, including members of the Yuba County Board of Supervisors and engineers trained at institutions like Stanford University and the University of California, Berkeley, advocated for a high concrete arch dam to replace older diversion works. Environmental law discussions prompted input from groups such as the Sierra Club and regional planning agencies including the California State Water Resources Control Board during hearings in the 1960s. Construction milestones coincided with broader infrastructure efforts like the Transcontinental Railroad centennial conversations and postwar civil works expansion. The dam was completed and dedicated with participation from state officials and representatives of agencies including the Federal Power Commission.

Design and Construction

Engineers from consulting firms connected to projects such as Hoover Dam and designers influenced by the Bureau of Reclamation developed the concrete thin-arch design, which echoes earlier arch dams like Glen Canyon Dam and Palisades Dam. Construction techniques involved high-capacity concrete placement, cofferdams, and diversion tunnels comparable to methods used at Shasta Dam and Oroville Dam. Contractors coordinated with equipment suppliers tied to firms that worked on Grand Coulee Dam and utilized geotechnical investigations referencing regional geology mapped by the United States Geological Survey and seismic studies from Caltech researchers. Labor was organized under trade unions such as the International Brotherhood of Electrical Workers and the United Brotherhood of Carpenters and Joiners of America, and safety practices reflected standards promoted by the Occupational Safety and Health Administration. Construction challenges included foundation preparation against metamorphic bedrock similar to formations described in Sierra Nevada geologic studies, and the placement of high-strength concrete for a 645-foot structural height. The completion involved installation of intake towers and penstocks comparable to systems at Folsom Dam.

Reservoir and Hydrology

New Bullards Bar Reservoir stores runoff from the North Yuba River watershed, interacting hydrologically with tributaries and regional river systems studied by hydrologists from institutions such as University of California, Davis and California Institute of Technology. The reservoir influences downstream flow regimes on the Yuba River and joins coordinated operations with reservoirs like Englebright Dam and New Melones Lake within the wider Sacramento River basin. Water rights issues and allocations involve stakeholders including the California Water Resources Board and agricultural districts in Yuba County and neighboring Sutter County. Seasonal storage and flood control operations are informed by precipitation and snowpack monitoring conducted by the National Weather Service and the California Department of Water Resources snow surveys. Sedimentation dynamics echo concerns studied at reservoirs such as Trinity Lake and Shasta Lake, while reservoir management incorporates protocols developed after incidents at sites like Oroville Dam.

Power Generation

The dam’s hydroelectric facilities include a powerhouse with turbines and generators producing peaking power dispatched into the California Independent System Operator grid and integrated with regional transmission operators like Pacific Gas and Electric Company interties. The installed capacity, using Francis turbines similar to technology employed at Smith Mountain Lake and Hoover Dam, supports load balancing for utilities and participates in ancillary services markets regulated by agencies such as the Federal Energy Regulatory Commission. Maintenance and upgrades have invoked manufacturers and service firms that also work on turbines at Bonneville Dam and generators at Grand Coulee Dam. Power revenues contribute to financing by the Yuba County Water Agency and contractual power sales involve municipal utilities and investor-owned utilities including Sacramento Municipal Utility District and Pacific Gas and Electric Company.

Environmental and Recreational Impacts

Environmental assessments addressed effects on fish species studied by biologists from California Department of Fish and Wildlife and conservation organizations like the Trout Unlimited and the Sierra Club. Impacts on anadromous fish migrations in the Yuba River prompted mitigation measures akin to those required at Englebright Dam and collaborative programs with the National Marine Fisheries Service. Recreational amenities around the reservoir resemble developments at Shasta Lake and include boating, fishing, camping, and hiking that attract visitors from metropolitan areas such as Sacramento, California and San Francisco, California. Local tourism ties to regional parks managed by Yuba County Parks and federal lands administered by the U.S. Forest Service influence economic activity in communities like Marysville, California and Dobbins, California. Wildlife habitat considerations connect to studies at Sutter National Wildlife Refuge and to statewide conservation planning under agencies such as the California Department of Fish and Wildlife.

Safety, Seismic Considerations, and Maintenance

Safety protocols reference seismic hazard analyses from the United States Geological Survey and academic research from University of California, Berkeley and California Institute of Technology concerning faults in the Sierra Nevada region and nearby fault systems like the San Andreas Fault complex. Structural evaluations employ techniques developed for aging infrastructure that were applied at Oroville Dam and Folsom Dam, including instrumentation, regular inspections, and emergency action planning coordinated with Federal Emergency Management Agency and county emergency services. Maintenance programs involve concrete repair methods used at large dams such as Hoover Dam and turbine refurbishment practices consistent with guidance from the Hydropower Reform Coalition. Security and operational coordination include liaison with utilities such as Pacific Gas and Electric Company and regional grid operators including the California Independent System Operator.

Category:Dams in California