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

Local reservoir storage, in acre-feet, for Water Authority member agencies - As of April 16, 2018

Agency Reservoir Capacity (AF) Storage (AF) % of Capacity Change from Year Earlier (AF) Change from Month Earlier (AF)
Carlsbad M.W.D. Maerkle 600 49 8 (96) (21)
Escondido, City of Dixon 2,606 2,451 94 86 (16)
Escondido, City of Wohlford 6,506 2,138 33 48 (36)
Fallbrook P.U.D. Red Mountain 1,335 275 21 (197) (3)
Helix W.D. Cuyamaca 8,195 706 9 (2,497) 30
Helix W.D. Jennings 9,790 8,929 91 210 (3)
Poway, City of Poway 3,330 3,144 94 138 72
Rainbow M.W.D. Morro Hill 465 242 52 133 (9)
Ramona M.W.D. Ramona 12,000 2,221 19 (645) 0
San Diego County Water Authority Olivenhain 24,774 20,965 85 1,443 907
San Diego, City of Barrett 34,806 12,207 35 (345) 38
San Diego, City of El Capitan 112,807 27,692 25 (22,339) (67)
San Diego, City of Hodges 30,633 14,730 48 (7,174) (451)
San Diego, City of Lower Otay 47,067 35,449 75 (10,413) (1,071)
San Diego, City of Miramar 6,682 5,411 81 (14) (282)
San Diego, City of Morena 50,694 3,901 8 (1,017) 95
San Diego, City of Murray 4,684 4,098 81 599 62
San Diego, City of San Vicente 249,358 187,052 75 (11,019) (146)
San Diego, City of Sutherland 29,508 13,227 45 (230) (283)
San Dieguito W.D. San Dieguito 883 372 42 (4) (17)
Sweetwater Authority Loveland 25,400 14,235 56 718 620
Sweetwater Authority Sweetwater 28,079 7,301 26 (8,478) (838)
Valley Center M.W.D. Turner 1,612 1,200 74 (412) 0
Vista I.D. Henshaw 51,774 4,462 9 (11,046) 142
Totals   743,588 372,456 50 (72,547) (1,276)

Date generated: 4/23/2018

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.