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

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 (21) (1)
Escondido, City of Dixon 2,606 2,509 96 96 14
Escondido, City of Wohlford 2,783 2,306 83 (56) (182)
Fallbrook P.U.D. Red Mountain 1,335 289 22 (100) (100)
Helix W.D. Cuyamaca 8,195 588 7 172 (48)
Helix W.D. Jennings 9,790 8,225 84 (625) (25)
Poway, City of Poway 3,432 3,168 92 135 95
Rainbow M.W.D. Morro Hill 465 270 58 118 130
Ramona M.W.D. Ramona 12,000 2,156 18 (136) (118)
San Diego County Water Authority Olivenhain 24,774 19,849 80 820 (1,315)
San Diego, City of Barrett 34,806 16,432 47 5,174 (166)
San Diego, City of El Capitan 112,807 43,000 38 14,767 (1,037)
San Diego, City of Hodges 30,633 12,306 40 332 91
San Diego, City of Lower Otay 47,067 37,697 80 6,548 (137)
San Diego, City of Miramar 6,682 5,370 80 (236) (96)
San Diego, City of Morena 50,694 4,467 9 1,285 (133)
San Diego, City of Murray 4,684 4,114 88 (54) 54
San Diego, City of San Vicente 249,358 192,508 77 9,383 (296)
San Diego, City of Sutherland 29,508 6,020 20 (6,480) (99)
San Dieguito W.D. San Dieguito 883 393 45 (94) (18)
Sweetwater Authority Loveland 25,400 11,519 45 (2,528) (111)
Sweetwater Authority Sweetwater 28,079 8,898 32 4,873 (864)
Valley Center M.W.D. Turner 1,612 1,388 86 263 (120)
Vista I.D. Henshaw 51,774 4,364 8 2,444 (258)
Totals   739,967 387,836 52 36,079 (4,739)

Date generated: 10/30/2019

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.