The U.S. Army Corps of Engineers, Detroit District (Corps) has conducted an environmental analysis in accordance with the National Environmental Policy Act of 1969, as amended. The Environmental Assessment (EA) and Public Notice (dated 13 February 2017) for the North Branch Ecorse Creek Flood Risk Management Study address the environmental consequences of reducing flood hazards and flood damage costs, and providing effective flood risk management measures, for communities along the North Branch Ecorse Creek, Wayne County, Michigan. Public review of the EA and Preliminary FONSI was completed on 15 March 2017.
Alternatives evaluated in the EA include 1) No Action Alternative, 2) Corps’ 1988 Retention Basin Alternative, 3) Wayne County 2008 Greenway Alternative, 4) Optimized Powers Basin Alternative, 5) Detention Basins with Limited Channel Improvements Alternative, and 6) Optimized Powers Basin with Channel Improvements Alternative.
The recommended alternative presented in Section 2 of the EA is Alternative 6 —Optimized Powers Basin with Channel Improvements. However, further evaluation showed that the proposed channel improvements do not meet USACE planning criteria. Therefore, only the detention basin part of the recommended alternative is being pursued, which is the same as Alternative 4, Optimized Powers Basin.
Under Alternative 4, the USACE proposes to construct a single, optimized detention basin (the Powers Basin) northeast of North Inkster Road and Powers Avenue (the Powers Site) in Inkster, Michigan. While flood damage reduction from the channel improvements would not be realized, Alternative 4 still provides substantial flood damage reduction compared to without project conditions.
A Finding of No Significant Impact for Alternative 4, Optimized Powers Basin, was signed on July 8, 2020, and is provided below along with the EA and other documents related to the study.