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.
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