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Farmland Mapping and Monitoring Program
Reservoir development in California

Although most large water facilities were developed prior to FMMP's establishment, FMMP has documented a number of new lakes in northern and southern California since 1984. These facilities range from 100,000 to 800,000 acre-feet of water, and are used for drinking supplies, flood control, and recreation. Accompanying each of these new lakes are thousands of acres of open space reserves that protect the watershed and provide species habitat.

Diamond Valley Lake,
Riverside County,
800,000 acre-feet
  • Built by the Metropolitan Water District of Southern California in the late 1990’s.

  • Water arrives via the Colorado River Aqueduct and the State Water Project, to provide a 6-month emergency supply for southern California.

  • Nearly 13,000 acres were added to nearby ecological reserves as project mitigation.

  • The lake’s surface area of 4,500 acres covered land that had been Prime Farmland, Farmland of Statewide Importance, and other FMMP categories, when it began filling in 2000.

Diamond Valley Lake

Lake Sonoma,
Sonoma County,
381,000 acre-feet
  • Built by the Army Corps of Engineers in the mid 1980’s.

  • The 319 foot earthen dam creates the lake, which extends 9 miles on Dry Creek and 4 miles on Warm Springs Creek.

  • 8,000 acre open space reserve.

  • Inundated Grazing land on FMMP maps between 1984 and 1986.

Lake Sonoma 

Los Vacqueros Reservoir,
Contra Costa County,
100,000 acre-feet
  • Built by the Contra Costa Water District in the late 1990’s.

  • Water is pumped from the Sacramento-San Joaquin delta to provide storage.

  • 18,500 acre open space reserve.

  • Approximately 1,400 acres of Grazing land and Farmland of Local Importance converted to Water on FMMP maps between 1998 and 2000.

Los Vacqueros Reservoir