River Raisin Dam Remediation Project
Project Progress and Photos
Lake Erie is now reconnected to the lower 3.5 miles of the River Raisin!
Phase 1 construction was substantially completed in November 2012, which means fish now have access over 4 of the low head dams on the Raisin River. Final restoration will take place in Spring 2013. Construction included the removal of Dams 2 and 3 and installation of rock arch rapids at Dams 6 and 1. Below are some before and after photos of Dams 6 and 1.
Dam 1 – Before construction
Dam 1 – After construction
Close up of rock arches at Dam 1
Dam 6 – Before construction
Dam 6 – During construction
Dam 6 – After construction
Phase 2 is in the permitting phase. Construction is expected to occur in Summer 2013 after the City receives a permit from the MDEQ. The current design includes installation of rock arch rapids at Dams 4 and 5 similar to those at Dams 6 and 1. There are also plans to install a small, natural channel that will allow fish passage around the Waterloo Dam. The last component of this project includes removal of a logjam and failing control structure at the Grape Dam millrace. A rock vane is proposed upstream of the millrace to prevent future logjams from restricting flow to the millrace. Below are some examples of the preliminary design drawings.
Preliminary drawing for Dam 4 design
Preliminiary drawing for Dam 5 design
Conceptual channel design adjacent to the Waterloo Dam
Severe logjam and failing structure at the Grape Dam millrace