Reservoirs

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 740,000 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 41 7 40 (225)
Escondido, City of Dixon 2,606 2,474 95 34 (14)
Escondido, City of Wohlford 2,783 1,958 70 (404) (120)
Fallbrook P.U.D. Red Mountain 1,335 373 28 (99) 3
Helix W.D. Cuyamaca 8,195 542 7 (344) (28)
Helix W.D. Jennings 9,790 8,891 91 (108) 956
Poway, City of Poway 3,432 3,096 90 105 (60)
Rainbow M.W.D. Morro Hill 465 60 13 (274) (24)
Ramona M.W.D. Ramona 12,000 1,443 12 (667) (57)
San Diego County Water Authority Olivenhain 24,774 18,265 74 (2,323) (446)
San Diego, City of Barrett 34,806 20,195 58 3,042 (111)
San Diego, City of El Capitan 112,807 34,896 31 (9,054) (1,997)
San Diego, City of Hodges 13,401 11,709 87 (874) (88)
San Diego, City of Lower Otay 47,067 39,168 83 (1,588) (511)
San Diego, City of Miramar 6,682 5,592 84 357 85
San Diego, City of Morena 50,694 5,075 10 298 (117)
San Diego, City of Murray 4,684 4,183 89 174 78
San Diego, City of San Vicente 249,358 165,031 66 (30,181) (70)
San Diego, City of Sutherland 29,508 10,502 36 3,908 (46)
Santa Fe Irrigation District San Dieguito 883 420 48 (5) 80
Sweetwater Authority Loveland 25,400 18,123 71 5,076 (408)
Sweetwater Authority Sweetwater 28,079 5,693 20 (3,051) (144)
Valley Center M.W.D. Turner 1,612 1,387 86 (225) 0
Vista I.D. Henshaw 51,774 5,953 11 902 (36)
Totals   722,735 365,068 51 (35,262) (3,299)

Date generated: 12/30/2020

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.