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 May 8, 2017

Agency Reservoir Capacity (AF) Storage (AF) % of Capacity Change from Year Earlier (AF) Change from Month Earlier (AF)
Carlsbad M.W.D. Maerkle 600 186 31 109 72
Escondido, City of Dixon 2,606 2,359 91 (54) 7
Escondido, City of Wohlford 6,506 2,114 32 132 12
Fallbrook P.U.D. Red Mountain 1,335 624 47 109 152
Helix W.D. Cuyamaca 8,195 2,306 28 1,410 (1,501)
Helix W.D. Jennings 9,790 8,784 90 30 78
Poway, City of Poway 3,330 2,958 89 (138) (42)
Rainbow M.W.D. Morro Hill 465 288 62 148 193
Ramona M.W.D. Ramona 12,000 2,783 23 316 (104)
San Diego County Water Authority Olivenhain 24,774 19,181 77 (1,675) 34
San Diego, City of Barrett 34,806 12,765 37 10,617 310
San Diego, City of El Capitan 112,807 50,639 45 25,363 374
San Diego, City of Hodges 30,633 21,903 72 9,259 (449)
San Diego, City of Lower Otay 47,067 45,665 97 9,683 (394)
San Diego, City of Miramar 6,682 5,195 78 (270) 512
San Diego, City of Morena 50,694 4,736 9 3,342 0
San Diego, City of Murray 4,684 4,137 88 118 (31)
San Diego, City of San Vicente 249,358 193,255 78 17,406 (4,892)
San Diego, City of Sutherland 29,508 13,815 47 11,336 534
San Dieguito W.D. San Dieguito 883 561 64 150 172
Sweetwater Authority Loveland 25,400 13,987 55 6,445 670
Sweetwater Authority Sweetwater 28,079 15,314 55 11,044 (635)
Valley Center M.W.D. Turner 1,612 1,612 100 412 0
Vista I.D. Henshaw 51,774 14,520 28 8,668 (1,221)
Totals   743,588 439,686 59 113,958 (6,148)

Date generated: 05/08/2017

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.