Seven Oaks Reservoir

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Seven Oaks Reservoir
Location San Bernardino County, California
Coordinates 34°07′04″N 117°05′52″W / 34.11778°N 117.09778°W / 34.11778; -117.09778Coordinates: 34°07′04″N 117°05′52″W / 34.11778°N 117.09778°W / 34.11778; -117.09778
Type reservoir
Primary inflows Santa Ana River
Primary outflows Santa Ana River
Basin countries United States

Seven Oaks Reservoir is a reservoir on the Santa Ana River in San Bernardino County, California, about 8 miles (13 km) northeast of the city of Redlands. The reservoir is formed by Seven Oaks Dam, which was completed in 1999.

The United States Army Corps of Engineers built the zoned earth-and-rock-fill dam at the foot of the San Bernardino Mountains to protect against flooding in the eastern portion of the Greater Los Angeles Area. Its maximum height is 550 feet (168 m) above the pre-existing streambed and 650 feet (198 m) above the lowest portion of the foundation. The reservoir is medium-sized at 147,970 acre feet (182,520,000 m3), though it is a bit large for a reservoir whose sole purpose is flood control, which means that water is released as soon as safely possible, while still slow enough to allow water to seep into the streambed, recharging the groundwater aquifer. Also, releases are coordinated with Prado Dam, which is 40 miles (60 km) downstream.

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