The Tisdale Weir is a critical state-owned flood risk reduction and State Plan of Flood Control facility 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 multi-benefit Tisdale Weir Rehabilitation and Fish Passage Project (Project) will construct needed structural repairs to the weir, and will modify the weir to add new onsite fish passage and low flow bypass channel connection facilities.
The Project will improve public safety by ensuring ongoing conveyance of excess floodwaters while reducing historical adult fish-stranding issues at and just downstream of the weir as flood waters recede and flow from the Sacramento River to Tisdale Bypass ends. Of key concern are ongoing historical losses to Chinook salmon and North American green sturgeon. Post-repair and construction adaptive management methods will be applied to monitor weir and bypass flood operations and fish passage, and if necessary make additional refinements to project facilities based on field observations and scientific analysis.
The Project includes a project-level feasibility study conducted in partnership with federal, state, and local agencies partners and stakeholders to evaluate various alternatives to address multi-benefit flood and habitat management issues in the four-mile long Tisdale Bypass. Evaluated alternatives would address current sediment management, flood operations, and maintenance challenges; potential floodplain habitat opportunities for juvenile fish rearing; and authorization of long-term and sustainably-funded operations, maintenance, and habitat policies and practices. The outcome of the feasibility study will inform development and implementation of a comprehensive Tisdale Bypass Management Plan.
Project implementation is consistent with the California Water Action Plan, and the Central Valley Flood Protection Plan 2017 Update (adopted August 25, 2017) which identifies between $17 and $21 billion of needed improvements to State Plan of Flood Control levees and facilities in the Central Valley over the next 30 years. Project funding will be coordinated with expenditure of remaining Proposition 1E and Proposition 84 funds. Total project amount includes State support costs for project implementation.
Department of Water Resources
Infrastructure Improvement, Water Management, Research/Planning (including Science)
Project Benefits a Disadvantaged Community (or SDAC):