Enhancing SALMON fish passages | TISDALE WEIR

Описание: Tisdale Weir Rehabilitation and Fish Passage Project tour for Bridge Group members after a high water event on the Sacramento River. NorCal Guides president James Stone takes John Atkinson of Golden Gate Fishermen's Association GGFA.net and Sarah Bates of the Pacific Coast Federation of Fishermen's Associations PCFFA.org to the Tisdale Boat Ramp so they can better understand how the salmon navigate through the complex water system in Northern California's Central Valley floodplain areas. Cal Trout's Jacob Katz joins the tour to better explain the construction going on to build a notch or hole into the weir to allow fish to pass.    • Why CalTrout: Jacob Katz  

Cal Trout's goal: Retrofit flood infrastructure in the Tisdale and Sutter bypasses to enhance fish passage; improve water use efficiency; create floodplain rearing habitat for endangered salmonids; and increase floodplain fish food production benefiting endangered fish populations. Estimated completion date is 2030.    • Science-Based Solutions for a Better Calif...  

This project seeks to update flood and water infrastructure and operational practices on the Sutter and Yolo bypasses to add fish benefits (enhance adult fish passage; facilitate long-duration floodplain inundation to create rearing habitat for endangered salmonids; increase floodplain fish food production) to the flood protection, agricultural and waterbird habitat benefits already provided by these managed floodways.

HISTORY: 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.

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.

#salmonfishing #tisdaleboatramp #sacramentoriver

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