California Department of Fish and Wildlife

Patterson Irrigation District Fish Screen Project

Patterson Irrigation District Diversion after construction

Patterson Irrigation District Fish Screen and Intake Facility, 2011
Photo by Patterson Irrigation District

Location: San Joaquin River Mile 98.5, approximately 3.5 miles east of the city of Patterson, California

Total Project Cost: $13.8 Million: $6.9 Million Federal (Anadromous Fish Screen Program); $5.38 Million State (Ecosystem Restoration Program); $1.52 Million Local (Patterson Irrigation District)

Partners: Bureau of Reclamation, U.S. Fish and Wildlife Service, National Marine Fisheries Service, CDFW, Patterson Irrigation District

Project Summary: Patterson Irrigation District provides irrigation water to nearly 13,500 acres of farmland and ranches in the San Joaquin Valley. Patterson Irrigation Districtís 195 cubic feet per second diversion on the San Joaquin River has served as the districtís primary source of water for over 100 years.

The San Joaquin River is a critical migration route for Chinook salmon and Central Valley steelhead which migrate to the ocean as young fish and then return in subsequent years as adults. The new Patterson Irrigation District Fish Screen and Intake Facility prevents entrainment of these at-risk native fish species by replacing their existing unscreened diversion with a state-of-the-art fish screen and intake facility which meets or exceeds federal and state screening criteria.

Beginning in 2001, the Ecosystem Restoration Program provided grant funding for the planning, environmental compliance, and construction phases of this project. Construction was completed in approximately one year and Patterson Irrigation District held a dedication ceremony for the new fish screen and intake facility on September 29, 2011.