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 (86) (13)
Escondido, City of Dixon 2,606 2,440 94 ---- 75
Escondido, City of Wohlford 6,506 2,162 33 (12) 12
Fallbrook P.U.D. Red Mountain 1,335 286 21 48 20
Helix W.D. Cuyamaca 8,195 423 5 (128) 58
Helix W.D. Jennings 9,790 8,986 92 60 20
Poway, City of Poway 3,432 3,290 96 355 282
Rainbow M.W.D. Morro Hill 465 299 64 102 204
Ramona M.W.D. Ramona 12,000 2,342 20 31 (12)
San Diego County Water Authority Olivenhain 24,774 23,707 96 4996 2416
San Diego, City of Barrett 34,806 11,083 32 (973) 139
San Diego, City of El Capitan 112,807 26,172 23 (8,299) (163)
San Diego, City of Hodges 30,633 11,885 39 (2,203) 467
San Diego, City of Lower Otay 47,067 32,766 70 (6,727) 961
San Diego, City of Miramar 6,682 5,376 80 (89) (172)
San Diego, City of Morena 50,694 2,988 6 (973) 9
San Diego, City of Murray 4,684 4,044 86 (69) (31)
San Diego, City of San Vicente 249,358 172,465 69 (14,369) (1,128)
San Diego, City of Sutherland 29,508 11,067 38 (2,125) (1,028)
San Dieguito W.D. San Dieguito 883 389 44 (4) (36)
Sweetwater Authority Loveland 25,400 13,339 53 (411) 80
Sweetwater Authority Sweetwater 28,079 3,809 14 (5,882) 138
Valley Center M.W.D. Turner 1,612 1,092 68 (76) ----
Vista I.D. Henshaw 51,774 2,965 6 (383) 643
Totals   743,690 343,375 46 (37,218) 2,938

Date generated: 12/27/2018

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.