Guadalupe River Flood Control Projects

Categorized Under: Environment



ICF worked with the Santa Clara Valley Water District and the U.S. Army Corps of Engineers, Sacramento and San Francisco Districts, on three flood protection projects along the Guadalupe River in Santa Clara County, California. The three projects (Upper, Downtown, and Lower Guadalupe River Projects) included flood protection components, habitat restoration components, and fish passage components.

For the Upper Guadalupe River Project, ICF—under contract to SCVWD—prepared an Environmental Impact Report (EIR)/Environmental Impact Statement (EIS) for the project. The EIR/EIS was certified by SCVWD in August 2001 and was recognized by the Association of Environmental Professionals and awarded Outstanding Environmental Analysis Document. ICF conducted vegetation and wildlife surveys in the project area and developed an hourly water temperature model (JSATEMP model) of the Guadalupe River watershed that allowed for the analysis of the effect of different alternatives on water temperature conditions.

In addition, ICF participated in an interagency Habitat Evaluation Procedure (HEP) analysis of project alternatives and prepared an analysis of the project’s effects on shaded riverine aquatic (SRA) cover. ICF prepared a biological assessment that addressed potential impacts on steelhead and Chinook salmon. National Oceanic and Atmospheric Administration (NOAA) Fisheries determined that the project would not jeopardize the continued existence of threatened steelhead.

ICF also prepared a mitigation and monitoring plan for the project. We worked on detailed design and construction documents for the first phase of mitigation for the project that included channel realignment and sizing to accommodate design flows and instream restoration; installation of instream geomorphic features to provide fish habitat and passage; and installation of riparian plantings to provide SRA cover that will serve as habitat for fish and maintain bank stability. ICF participated in public workshops on the project and is assisting in the project’s permitting and regulatory compliance.

For the Downtown Guadalupe River Project, ICF—under contract to the USACE Sacramento District—developed flood protection and habitat restoration alternatives; conducted vegetation, wildlife, and fisheries monitoring; prepared water temperature analyses of project alternatives using the JSATEMP model; analyzed hydraulic parameters of conceptual alternatives; conducted HEP analyses of project alternatives; and identified habitat restoration options in the Guadalupe River watershed.

For the Lower Guadalupe River Project, ICF—under contract to SCVWD—assessed environmental and hydraulic components of the project, which includes tidal portions of the Guadalupe River and Alviso Slough, and prepared the EIR for the project.

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Insight Details

Client: Santa Clara Valley Water District (SCVWD) and U.S. Army Corps of Engineers (USACE)
Location: Sacramento and San Francisco Districts, California

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