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 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

Local reservoir storage, in acre-feet, for Water Authority member agencies - As of January 2, 2018

Agency Reservoir Capacity (AF) Storage (AF) % of Capacity Change from Year Earlier (AF) Change from Month Earlier (AF)
Carlsbad M.W.D. Maerkle 600 85 14 (63) (2)
Escondido, City of Dixon 2,606 2,502 96 (14) 68
Escondido, City of Wohlford 6,506 2,162 33 (341) (48)
Fallbrook P.U.D. Red Mountain 1,335 244 18 (158) 11
Helix W.D. Cuyamaca 8,195 551 7 (196) (19)
Helix W.D. Jennings 9,790 8,926 91 87 461
Poway, City of Poway 3,330 2,916 88 (198) (120)
Rainbow M.W.D. Morro Hill 465 251 54 156 204
Ramona M.W.D. Ramona 12,000 2,287 19 (244) 12
San Diego County Water Authority Olivenhain 24,774 18,495 75 (333) (417)
San Diego, City of Barrett 34,806 12,056 35 10,158 0
San Diego, City of El Capitan 112,807 33,402 30 9,613 (3,611)
San Diego, City of Hodges 30,633 14,155 46 1,324 (1,130)
San Diego, City of Lower Otay 47,067 39,168 83 1,060 (1,541)
San Diego, City of Miramar 6,682 5,465 82 (126) 96
San Diego, City of Morena 50,694 3,973 8 2,897 12
San Diego, City of Murray 4,684 4,129 88 8 (39)
San Diego, City of San Vicente 249,358 186,762 75 1,455 (291)
San Diego, City of Sutherland 29,508 13,175 45 11,016 (106)
San Dieguito W.D. San Dieguito 883 380 43 78 20
Sweetwater Authority Loveland 25,400 13,748 54 6,554 (68)
Sweetwater Authority Sweetwater 28,079 9,558 34 6,626 (692)
Valley Center M.W.D. Turner 1,612 1,167 72 105 (33)
Vista I.D. Henshaw 51,774 3,335 6 (331) (102)
Totals   743,588 378,889 51 49,131 (7,334)

Date generated: 1/4/2018

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.