Fresno Bee Newsroom Blog

San Joaquin River water releases will increase

This week, San Joaquin River water started pouring out of Friant Dam a little faster than it has been. It’s part of the experimental flows in the river restoration project.

For those who don’t follow the river closely, I’ll explain a little. Water releases from Friant have been going on for decades to supply land owners immediately downstream of the dam. It’s usually just a trickle.

This week, the U.S. Bureau of Reclamation is ramping up to 1,050 cubic feet per second — about 2,000 acre-feet of water per day. Later this week, the release will be dropped to 700 cfs through Nov. 6. Then it will dip to 350 until the end of February.

The restoration project, which began four years ago, is supposed to reconnect the dried parts of the river with the Pacific Ocean. One goals in the project is to bring back runs of salmon that died off decades ago.

The releases over the next several days mimic nature by attracting migrating chinook salmon to move upstream for spawning, a bureau spokeswoman said. Biologists and other wildlife officials are studying the river’s reaction to the reintroduction of fish and flows.

Biologists have tagged and planted salmon in the river to follow their progress.

A big concern is seepage downstream beyond the Mendota Pool on the Valley’s west side. The flows have gotten into farm fields and caused damage, growers say.

Federal officials have installed underground water monitoring systems to detect when groundwater is rising in reaction to the extra flows.

Also local land owners have been alerted to call or email federal officials if they see seepage. Bureau leaders say they are prepared to reduce the flow if problems appear.