Project Description

The Santa Ana River Mainstem Project is located along a 75-mile reach of the Santa Ana River in Orange, Riverside and San Bernardino counties. The plan for flood control improvements includes three principal features:

  • Lower river channel modification for flood control along theĀ 30 miles of the Santa Ana River from Prado Dam to the Pacific Ocean.
  • Construction of Seven Oaks Dam (about 38 miles upstream of the existing Prado Dam) with a gross reservoir storage of 145,600 acre-feet.
  • Enlargement of Prado Dam to increase reservoir storage capacity from 217,000 acre-feet to 362,000 acre-feet.