The 472-acre Cosumnes Floodplain Mitigation Bank is located at the confluence of the Cosumnes and Mokelumne Rivers in Sacramento County, California. The project restored wetlands and low floodplain riparian forests to the property by breaching an agricultural levee on the Cosumnes River and constructing tidal channels to allow routine (e.g., annual) flood events and tidal action to occur on the site. The restoration of the floodplain also restored fisheries habitats.
Monitoring conducted from 2010-2016 showed that the site met all success criteria and was performing as intended to provide wetland and floodplain riparian habitats, as well as supporting a number of fish species during flood events. The U.S. Army Corps of Engineers, California Department of Fish and Wildlife, and National Marine Fisheries Service have issued their final credit releases for the bank. Credits available are:
- Restored Floodplain Mosaic Wetlands
- Restored Floodplain Riparian Habitat
- Enhanced Floodplain Riparian Habitat
- Restored Shaded Riverine Aquatic
- Preserved Shaded Riverine Aquatic
These credit types can provide mitigation for impacts to a variety of wetland habitats as follows:
Now that the bank has met all performance standards and has obtained its final credit release, the bank has entered its long-term management period. The bank is covered by a perpetual conservation easement, restricting its uses, and it and will be managed and maintained as wetland and fisheries habitat in perpetuity. An endowment provides funding for monitoring, maintenance, and reporting of the bank, which will occur annually in perpetuity.
Contact Travis Hemmen or Sarah Correa at (916) 646-3644 to learn more about the site and available credits.