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 600 161 27 160.0 76.0
Escondido, City of Dixon 2,606 2,427 93 (61.5) (41.0)
Escondido, City of Wohlford 2,783 2,292 82 202.0 118.0
Fallbrook P.U.D. Red Mountain 1,335 716 54 265.5 359.3
Helix W.D. Cuyamaca 8,195 747 9 (31.7) (75.0)
Helix W.D. Jennings 9,790 8,829 90 419.4 17.7
Poway, City of Poway 3,432 2,660 78 (49.1) (177.0)
Rainbow M.W.D. Morro Hill 465 376 81 87.0 248.0
Ramona M.W.D. Ramona 12,000 1,992 17 (591.0) (124.3)
San Diego County Water Authority Olivenhain 24,774 19,590 79 (1,646.0) (415.0)
San Diego, City of Barrett 34,806 21,319 61 4,141.1 (403.1)
San Diego, City of El Capitan 112,807 48,963 43 3,167.9 (974.0)
San Diego, City of Hodges 13,401 12,125 90 (1,406.5) (212.3)
San Diego, City of Lower Otay 47,067 42,559 90 4,862.4 (1,299.8)
San Diego, City of Miramar 6,682 5,649 85 (102.0) 183.6
San Diego, City of Morena 50,694 6,163 12 1,160.1 (337.0)
San Diego, City of Murray 4,684 4,114 88 77.7 38.4
San Diego, City of San Vicente 249,358 188,507 76 (5,726.3) (7,908.7)
San Diego, City of Sutherland 29,508 11,115 38 4,761.2 (566.4)
Santa Fe Irrigation District San Dieguito 883 631 71 (75.1) (81.6)
Sweetwater Authority Loveland 25,400 18,695 74 6,790.0 (179.0)
Sweetwater Authority Sweetwater 28,079 7,858 28 (3,994.0) (1,039.9)
Valley Center M.W.D. Turner 1,612 1,563 97 56.0 (49.0)
Vista I.D. Henshaw 51,774 6,804 13 (4,189.0) (1,956.0)
Totals   722,735 415,852 58 8,278.1 (14,798.1)

Date generated: 07/29/2020

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.