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Wetland and Floodplain Restoration
The Johnson Cosumnes Mitigation Bank is a 217-acre project located in Sacramento County along the Cosumnes River, adjacent to the Cosumnes River Preserve. The site is being restored from former agricultural land to reestablish historic floodplain and riparian habitats. Restoration activities include lowering or removing agricultural berms to reconnect the river to its floodplain, creating a network of channels to support natural flow patterns, and establishing native vegetation across a mosaic of wetlands and riparian areas.
The project is designed to restore ecological function and improve habitat connectivity within the Cosumnes River corridor. By reintroducing seasonal flooding and enhancing habitat diversity, the site will support native fish and wildlife, improve water quality, and contribute to a broader network of conserved lands in the region.
Location:
Sacramento County, CA
Credit Types:
- Floodplain Mosaic Wetlands
- Floodplain Riparian Habitat
- and Shaded Riverine Aquatic
Acres:
217.58
Approving Agencies:
California Department of Fish and Wildlife, National Oceanic and Atmospheric Administration, U.S. Army Corps of Engineers, U.S. Environmental Protection Agency
Restoration
WES plans to allow water to freely flow in and out of the site, re-establishing the floodplain. Floodplain habitat will promote nutrient exchange, provide food-web support for aquatic species, filter out excess nutrients and pollutants, recharge groundwater, and reduce floodwater velocities along the Cosumnes River.
Additionally, WES will enhance and re-establish riparian habitat to provide a dynamic floodplain, upland refugia, and shaded riverine habitat that will support a broad array of species on the site. The site will provide multiple benefits for local fish species, including juvenile Chinook salmon and Central Valley steelhead. The floodplain restoration design supports thermal refuge by increasing shade and vegetation, improving connectivity to cooler water and restoring natural flow patterns. To prevent fish stranding, the floodplain restoration design has configured channels in restored areas to create natural flow patterns and multiple channels, enhancing connectivity to the Cosumnes River.
