Ambrough Slough Habitat Rehabilitation and Enhancement Project. Upper Mississippi River System, Environmental Management Program, Definite Project Report/Environmental Assessment (SP-23). Pool 10, Upper Mississippi River, Crawford County, Wisconsin

摘要

The Ambrough Slough complex is a 1200-hectare area containing a number of backwater lakes, sloughs and other wetland habitats in pool 10 of the Upper Mississippi River near Prairie du Chien, Wisconsin. The habitat concerns within the Ambrough Slough complex are primarily related to providing adequate habitat for backwater fish, especially over wintering habitat. Backwater dredging is recommended for Spring Lake, Big Missouri Lake and Upper Doubles Lake to increase water depths and improve summer and winter fish habitat. The largest lake in the complex, Gremore Lake, suffers dissolved oxygen depletion in the winter, which would be alleviated by constructing a small channel to introduce flows from Ambrough Slough into Gremore Lake. Reducing flows at Black Slough, Upper Double Lake and Tilmont Lake would improve winter habitat conditions by reducing current velocities and maintaining water temperatures within tolerance ranges of backwater fish.