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 (46) 0
Escondido, City of Dixon 2,606 2,440 94 (11) (76)
Escondido, City of Wohlford 2,783 2,236 80 110 (238)
Fallbrook P.U.D. Red Mountain 1,335 592 44 142 65
Helix W.D. Cuyamaca 8,195 1,640 20 954 (1,691)
Helix W.D. Jennings 9,790 8,814 90 (120) (145)
Poway, City of Poway 3,432 2,934 85 (55) (367)
Rainbow M.W.D. Morro Hill 465 148 32 31 8
Ramona M.W.D. Ramona 12,000 2,852 24 613 (91)
San Diego County Water Authority Olivenhain 24,774 21,309 86 453 (441)
San Diego, City of Barrett 34,806 17,227 49 5,020 557
San Diego, City of El Capitan 112,807 44,428 39 16,871 1,942
San Diego, City of Hodges 30,633 16,576 54 2,253 (4,110)
San Diego, City of Lower Otay 47,067 39,168 83 4,511 (744)
San Diego, City of Miramar 6,682 5,493 82 151 (14)
San Diego, City of Morena 50,694 5,237 10 1,360 161
San Diego, City of Murray 4,684 4,091 87 0 46
San Diego, City of San Vicente 249,358 198,749 80 11,915 7,405
San Diego, City of Sutherland 29,508 7,536 26 (5,903) (3,293)
San Dieguito W.D. San Dieguito 883 471 53 91 74
Sweetwater Authority Loveland 25,400 10,907 43 (3,281) 795
Sweetwater Authority Sweetwater 28,079 15,109 54 8,257 (1,110)
Valley Center M.W.D. Turner 1,612 1,612 100 412 0
Vista I.D. Henshaw 51,774 17,118 33 12,664 (481)
Totals   739,967 426,686 58 56,391 (1,746)

Date generated: 5/15/2019

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.