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 85 14 84 28
Escondido, City of Dixon 2,606 2,468 95 82 0
Escondido, City of Wohlford 2,783 2,174 78 (300) (90)
Fallbrook P.U.D. Red Mountain 1,335 356 27 (6) (115)
Helix W.D. Cuyamaca 8,195 822 10 (33) (715)
Helix W.D. Jennings 9,790 8,811 90 (45) 8
Poway, City of Poway 3,432 2,837 83 (40) (172)
Rainbow M.W.D. Morro Hill 465 128 28 11 (161)
Ramona M.W.D. Ramona 12,000 2,116 18 (620) (135)
San Diego County Water Authority Olivenhain 24,774 20,005 81 (1,231) (583)
San Diego, City of Barrett 34,806 21,722 62 4,200 (203)
San Diego, City of El Capitan 112,807 49,937 44 3,563 (938)
San Diego, City of Hodges 13,401 12,337 92 (2,393) (338)
San Diego, City of Lower Otay 47,066.9 43,859 93 5,705 (1,560)
San Diego, City of Miramar 6,682 5,465 82 (126) (56)
San Diego, City of Morena 50,694 6,500 13 1,293 (191)
San Diego, City of Murray 4,684 4,075 87 65 48
San Diego, City of San Vicente 249,358 196,416 79 (3,386) (12,923)
San Diego, City of Sutherland 29,508 11,681 40 5,328 147
Santa Fe Irrigation District San Dieguito 883 712 81 0 (7)
Sweetwater Authority Loveland 25,400 18,874 74 6,878 10
Sweetwater Authority Sweetwater 28,079 8,898 32 (4,048) (898)
Valley Center M.W.D. Turner 1,612 1,612 100 0 0
Vista I.D. Henshaw 51,774 8,760 17 (5,506) (2,162)
Totals   722,735 430,650 60 9,475 (21,003)

Date generated: 07/01/2020

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.