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 740,000 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 600 114 19 113 (173)
Escondido, City of Dixon 2,606 2,440 94 0 (103)
Escondido, City of Wohlford 2,783 2,418 87 182 (42)
Fallbrook P.U.D. Red Mountain 1,335 608 46 16 78
Helix W.D. Cuyamaca 8,195 1,570 19 (70) 210
Helix W.D. Jennings 9,790 8,814 90 0 (171)
Poway, City of Poway 3,432 3,339 97 406 183
Rainbow M.W.D. Morro Hill 465 299 64 151 119
Ramona M.W.D. Ramona 12,000 2,305 19 (547) 195
San Diego County Water Authority Olivenhain 24,774 21,713 88 404 622
San Diego, City of Barrett 34,806 21,549 62 4,322 2,778
San Diego, City of El Capitan 112,807 52,491 47 8,063 7,361
San Diego, City of Hodges 13,401 13,628* 102 (2,947) 1,139
San Diego, City of Lower Otay 47,066.9 46,059 98 6,892 5,068
San Diego, City of Miramar 6,682 5,329 80 (164) (82)
San Diego, City of Morena 50,694 6,415 13 1,178 875
San Diego, City of Murray 4,684 4,019 86 (72) (9)
San Diego, City of San Vicente 249,358 215,720 87 16,971 8,242
San Diego, City of Sutherland 29,508 10,940 37 3,403 2,812
Santa Fe Irrigation District San Dieguito 883 471 53 0 51
Sweetwater Authority Loveland 25,400 18,245 72 7,338 3,035
Sweetwater Authority Sweetwater 28,079 10,032 36 (5,078) 2,109
Valley Center M.W.D. Turner 1,612 1,612 100 0 0
Vista I.D. Henshaw 51,774 11,383 22 (5,735) 4,676
Totals   722,735 461,512 64 34,826 38,971

Date generated: 04/30/2020

* Actual storage may temporarily exceed the restricted capacity following large runoff events.

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.