US Army Corps of Engineers
Rock Island District Website

Upper Mississippi River System Hydraulic Model Update

UMRS Hydraulic Model Update MapA flood risk management existing conditions hydraulic model is a tool which can be used to more accurately evaluate and communicate the effects of floodplain modifications. It can also help provide better predictability and more consistent flood risk management.

Development of a standardized and seamless flood risk management hydraulic model for the Upper Mississippi River System (UMRS) is an essential part of understanding the risks that currently exist to the river communities. It is a critical first step for the development of systemic flood risk management strategy.

As part of this effort, the Corps of Engineers is developing a new, updated hydraulic model for the Upper Mississippi River System, including the Illinois Waterway. This collaborative effort involves a variety of state and federal agencies, is facilitated by the Corps of Engineers Rock Island, St. Louis and St. Paul districts and uses the Hydrologic Engineering Center's River Analysis System known as HEC-RAS.

Click on the map to the right to see a larger view of the project phases.   

 

 

Project Status

Development of the UMRS Hydraulic Model Phase I was completed in January 2018 and was a collaborative effort by federal and state agencies, facilitated by USACE Rock Island and St. Louis Districts. It covers 320 river miles of the Mississippi River from Lock and Dam 19 at Keokuk, Iowa, (River Mile 364) to Thebes, Illinois, (River Mile 44) and used the Hydrologic Engineering Center’s River Analysis System (HEC-RAS) software. It includes detailed features, cross sections, and represents the entire floodplain from bluff to bluff.  

In fiscal year 2020, funding in the amount of $575,000 has been approved through Floodplain Management Services (FPMS) for the development of the remainder of the hydraulic models for the Upper Mississippi River. This includes UMRS Hydraulic Model Phases II and IV which cover a total of 500 river miles. Phase II stretches from Lock and Dam 10 at Guttenberg, Iowa, (River Mile 615) to Lock and Dam 19 at Keokuk, Iowa, (River Mile 364) and Phase IV covers the area from Anoka, Minnesota, (River Mile 860) to Lock and Dam 10 at Guttenberg, Iowa, (River Mile 615).

Funding for Phase III of the project, which includes 290 miles of the Illinois Waterway, is anticipated in future budget cycles.