Seven major stream systems originate in the mountains of San Diego County and drain to the Pacific Ocean. Runoff from these seven watersheds supplies 24 reservoirs that have a combined capacity of about 744,000 acre-feet.

The last major increase in regional water storage capacity was in 2014 when then San Vicente Dam Raise was completed, adding 157,000 acre-feet of capacity. While the region’s reservoirs were built mainly as water supply projects, many of them also provide other benefits such as recreation and flood reduction.

Since the major statewide drought of 1976-1977, annual surface water use from local reservoirs has ranged from 4,100 acre-feet in fiscal year 2015 to 140,300 acre-feet in fiscal year 1984. Over the past two decades, annual local surface water use has averaged approximately 60,000 acre-feet, or about 10 percent of the region’s average total annual water use.

Map of San Diego County Reservoirs

icon_pdf.pngLocal Rainfall and Reservoirs Fact Sheet

Metropolitan Water District of Southern California Reservoirs

Agency Reservoir Capacity (AF) Storage (AF) % of Capacity Change from Year Earlier (AF) Change from Month Earlier (AF)
Carlsbad M.W.D. Maerkle 600 0 0 (123) (1)
Escondido, City of Dixon 2,606 2,433 93 0 (34)
Escondido, City of Wohlford 2,783 2,418 87 256 292
Fallbrook P.U.D. Red Mountain 1,335 334 25 65 27
Helix W.D. Cuyamaca 8,195 3,088 38 2,490 2,599
Helix W.D. Jennings 9,790 8,979 92 (58) (28)
Poway, City of Poway 3,432 3,278 96 302 211
Rainbow M.W.D. Morro Hill 465 189 41 94 (39)
Ramona M.W.D. Ramona 12,000 2,894 24 655 577
San Diego County Water Authority Olivenhain 24,774 21,364 86 2,469 (982)
San Diego, City of Barrett 34,806 14,920 43 2,733 3,785
San Diego, City of El Capitan 112,807 38,134 34 8,623 11,701
San Diego, City of Hodges 30,633 20,854 68 5,779 7,581
San Diego, City of Lower Otay 47,067 39,029 83 1,877 5,583
San Diego, City of Miramar 6,682 5,493 82 83 (56)
San Diego, City of Morena 50,694 4,480 9 591 1,448
San Diego, City of Murray 4,684 4,121 88 15 (31)
San Diego, City of San Vicente 249,358 182,034 73 (4,946) 7,524
San Diego, City of Sutherland 29,508 11,632 39 (1,701) 2,787
San Dieguito W.D. San Dieguito 883 406 46 (4) 43
Sweetwater Authority Loveland 25,400 12,511 49 (1,427) (917)
Sweetwater Authority Sweetwater 28,079 9,857 35 1,411 5,832
Valley Center M.W.D. Turner 1,612 1,612 100 412 521
Vista I.D. Henshaw 51,774

14,951

29 11,089 11,239
Totals   739,967 405,012 55 30,685 59,662

Date generated: 2/25/2019

Note: Each reservoir’s change in storage level is a function of its unique operational characteristics, which may include movement of imported and local water supplies in and out of the reservoir as well as surface water capture from local rainfall.