Tisdale Weir Rehabilitation and Fish Passage Project

drone view of floodwaters flowing over the Tisdale Weir

A drone view of floodwaters from the Sacramento River flowing over the Tisdale Weir in Sutter County.

Built in 1932 by the U.S. Army Corps of Engineers atop an early structure built around 1911, the Tisdale Weir is a 1,150 foot-long concrete structure located on the east side of the Sacramento River, south of the town of Meridian in Sutter County, and four miles west of the Sutter Bypass. The Tisdale Weir is a critical component of the Sacramento River Flood Control Project (SRFCP). It is one of five major overflow weirs in the SRFCP, and during Sacramento River food events, it is typically the first to overflow and the last to stop flowing. The Sacramento River conveys 66,000 cubic feet per second (cfs) above the weir but only 30,000 below. When the flow exceeds 30,000 cfs, more than half of the floodwaters are diverted from the river over the weir and into the bypass system. 

Project Need 

The existing Tisdale Weir has been in operation for 87 years and needs structural rehabilitation due to aged concrete that is spalling (flaking) and exposing rebar. In addition, there is a long history of fish stranding behind the weir when flows from the Sacramento River recede below the weir crest. The proposed project would rehabilitate the weir to extend the design life and also provide passage for fish to the Sacramento River.