The city of Dubuque, Iowa, has two sanitary sewer mains, one thirty-inch and one forty-inch diameter, sanitary force mains and the Terminal Street lift station located adjacent to the Mississippi River in Dubuque County, Iowa. Loss of riprap protection along the length of the force main is threatening the safety and integrity of the forced main. Opportunities exist to reduce erosion and safety concerns through structural and non-structural measures.
High flow events on the Coon Creek and the unnamed tributary cause erosion on their banks, increasing sediment load and consequently sediment load into the Illinois Waterway.
The river bank is very steep at this location, and the concerns are that additional movement of the bank will not only affect the safe passage of vehicles on E. 2nd Street, but may also affect the operations of the Sinnissippi Dam, which is a source of hydroelectric power. An opportunity exists to protect the bank and prevent damages to the public infrastructure.
Carbon Cliff, Illinois, has a history of flooding from the Rock River and an unnamed tributary which runs through a portion of the City. The City would like assistance investigating alternatives, both structural and non-structural, to help reduce damages caused by flooding.
The Mackinaw River has developed a meandering channel pattern, with the meander bends through this reach causing a significant change in the angle of flow through the Wagonseller Road Bridge. This project reviews opportunities to stabilize the Mackinaw River streambanks, Wagonseller Road Bridge, and north and south bridge approaches.