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 1 0 (24) 0
Escondido, City of Dixon 2,606 2,495 96 21 7
Escondido, City of Wohlford 2,783 2,390 86 216 300
Fallbrook P.U.D. Red Mountain 1,335 233 17 (217) (217)
Helix W.D. Cuyamaca 8,195 706 9 251 (73)
Helix W.D. Jennings 9,790 8,284 85 (592) (125)
Poway, City of Poway 3,432 2,880 84 (76) 171
Rainbow M.W.D. Morro Hill 465 314 68 95 25
Ramona M.W.D. Ramona 12,000 2,441 20 197 (141)
San Diego County Water Authority Olivenhain 24,774 21,019 85 1,463 (217)
San Diego, City of Barrett 34,806 16,862 48 5,463 (315)
San Diego, City of El Capitan 112,807 45,043 40 17,787 (752)
San Diego, City of Hodges 30,633 12,706 41 1,027 (825)
San Diego, City of Lower Otay 47,067 5,606 12 (25,462) (32,091)
San Diego, City of Miramar 6,682 4,778 71 757 (973)
San Diego, City of Morena 50,694 4,010 8 709 (993)
San Diego, City of Murray 4,684 37,788 807 33,728 33,752
San Diego, City of San Vicente 249,358 193,631 78 9,779 (602)
San Diego, City of Sutherland 29,508 6,241 21 (6,465) (112)
San Dieguito W.D. San Dieguito 883 674 76 (32) (32)
Sweetwater Authority Loveland 25,400 11,766 46 (1,858) (139)
Sweetwater Authority Sweetwater 28,079 10,874 39 6,426 (978)
Valley Center M.W.D. Turner 1,612 1,507 93 382 0
Vista I.D. Henshaw 51,774 7,213 14 4,941 (3,780)
Totals   739,967 399,461 54 47,001 (8,113)

Date generated: 9/5/2019

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.