Pilot Floodplain Projects

Expand on multi-benefit use projects

Wallace Weir Retrofit Important Step for Central Valley Salmon

An important step toward supporting the rebound of native salmon populations in the Central Valley happened early October. The retrofit that is underway at Wallace Weir on the Yolo Bypass is a joint effort of farmers, conservationists and government agencies and will significantly reduce the number of adult salmon that go astray in agricultural drainage canals along the Sacramento River.



Long-term Goal

  • Facilitate pilot water infrastructure improvement projects that successfully demonstrate multi-benefit use of floodplains.

Recent Accomplishments

  • Facilitated construction of gates to block salmon from straying into the Colusa Basin Drain at Knights Landing Outfall Gates;
  • Continued to facilitate and support operation of a fish trapping facility at Knaggs Ranch to document straying of winter run, spring run and fall run Chinook salmon into the Knights Landing ridge cut and Colusa Basin drain;
  • Facilitated inclusion of managed floodplain designs in the EIS/EIR process for restoration of the Yolo Bypass as mandated by the Biological Opinion for the State Water Project and Central Valley project;
  • Facilitated engineering design, permitting and construction schedule for Wallace Weir Retrofit.

What We Will Achieve in 2016-17

  • Ground Breaking for Wallace Weir scheduled for June 2016. This will be the first major water project built under the States EcoRestore program. Project will replace dirt berm weir by with a year-round operable “bladder dam” structure that will block salmon from entering the Colusa Basin Drain. The upgrade will also re-route attraction flows to Upper Tule Canal; facilitate water management for winter floodplain habitat; enhance ag and wetland water management and increase floodplain food web subsidy to delta;
  • Secure engineering design for the following projects:
    • Fremont Fish Passage Enhancement Project
      Retrofit fish passage structure in Fremont Weir to allow connectivity with river at 22 feet. Project will facilitate annual upstream migration of adult salmon and sturgeon without disrupting Yolo Bypass land uses.
    • Tule Canal Fish Passage And Floodplain Habitat Project
      Modernize water infrastructure to prevent stranding & improve passage for adult salmon and sturgeon, prevent stranding of juvenile salmon, and enhance floodplain rearing habitat on 130-acres.
    • Sutter Bypass Weir One
      Solve adult stranding of Butte Creek Spring Run adult Chinook salmon while increasing juvenile salmon floodplain rearing habitat and improving water management for agriculture and the managed wetlands of the Sutter National Wildlife Refuge.

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California Trout, Inc.

California Trout, Inc.