Welcome to the Los Vaqueros Reservoir Expansion Project web site. This project is evaluating the feasibility of expanding Los Vaqueros Reservoir in Contra Costa County, California to enhance the Delta environment and improve water supply reliability and water quality for Bay Area water users. The project is an important component of California’s long-term plan to fix the San Francisco Bay/Sacramento-San Joaquin Delta (Bay-Delta) ecosystem, while effectively meeting the needs of millions  who depend on the Delta for water. The U.S. Department of the Interior, Bureau of Reclamation and the California Department of Water Resources have partnered with the Contra Costa Water District to complete the environmental review and feasibility study as required by state and federal regulations.