US Army Corps of Engineers
St. Paul District Website

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  • February

    St. Croix River Feasibility Study: Endangered Mussel Conservation

    Zebra mussels (Dreissena polymorpha) in the Upper Mississippi River are a significant threat to the endangered Higgins eye pearlymussel (Lampsilis higginsii) and winged mapleleaf (Quadrula fragosa). The U.S. Army Corps of Engineers, St. Paul District and Engineer Research and Development Center are conducting a study in cooperation with the U.S. Fish and Wildlife Service; the National Park Service; the Departments of Natural Resources from Minnesota, Wisconsin, and Iowa; and the Great Lakes Indian Fish and Wildlife Commission. Recommended management alternatives outside the Corps’ existing authorities would need to be implemented by others.