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 21 4 (66) (4)
Escondido, City of Dixon 2,606 2,413 93 (82) (61)
Escondido, City of Wohlford 6,506 2,362 36 98 188
Fallbrook P.U.D. Red Mountain 1,335 389 29 (30) (61)
Helix W.D. Cuyamaca 8,195 416 5 (230) (39)
Helix W.D. Jennings 9,790 8,851 90 1,003 (25)
Poway, City of Poway 3,432 3,033 88 634 77
Rainbow M.W.D. Morro Hill 465 152 33 (133) (67)
Ramona M.W.D. Ramona 12,000 2,293 19 (55) 48
San Diego County Water Authority Olivenhain 24,774 18,627 75 329 (963)
San Diego, City of Barrett 34,806 11,258 32 (1,082) (142)
San Diego, City of El Capitan 112,807 28,233 25 (12,026) 977
San Diego, City of Hodges 30,633 11,975 39 (5,795) 296
San Diego, City of Lower Otay 47,067 31,149 66 (13,585) 82
San Diego, City of Miramar 6,682 5,606 84 (14) 71
San Diego, City of Morena 50,694 3,182 6 (864) (119)
San Diego, City of Murray 4,684 4,168 89 158 108
San Diego, City of San Vicente 249,358 183,125 57 (7,637) (727)
San Diego, City of Sutherland 29,508 12,500 42 (1,064) (206)
San Dieguito W.D. San Dieguito 883 487 55 81 (219)
Sweetwater Authority Loveland 25,400 14,047 55 140 423
Sweetwater Authority Sweetwater 28,079 4,025 14 (8,439) (423)
Valley Center M.W.D. Turner 1,612 1,125 70 (113) ----
Vista I.D. Henshaw 51,774 1,920 4 (3,345) (352)
Totals   743,690 351,355 47 (52,118) (1,139)

Date generated: 10/23/2018

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.