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U.S. Army Corps of Engineers
St. Paul District
Programs & Project Management
180 5th St. E., Suite 700
St. Paul MN 55101

(651) 290-5755.


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Posted 9/12/2016

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Updated March 2018


The County Road M study area is located approximately 1 mile northeast of the village of Colfax, WI in west-central Wisconsin along the Red Cedar River in Dunn County. The site is approximately 75 miles east of St. Paul, MN. 

An area of County Road M along the east bank of the Red Cedar River northeast of Colfax, WI is being threatened by erosion. The erosion is occurring along the outside bend of the river. Based on surveys, a stretch of river bank that is approximately 500 feet long is actively eroding where the top of bank has encroached on the right-of-way for County Road M. Currently the top of bank is within 10‒15 feet of the shoulder at the center of the site. Further erosion would lead to a significant safety concern as the bank drops off approximately 50 feet to the river below.

County Road M is a heavily trafficked road that provides many farmsteads in the area with access to Colfax, WI. The Wisconsin Department of Transportation estimates the average daily traffic of that section of County Road M to be approximately 910 vehicles.


The Dunn County Public Works Department requested a study on October 30, 2015.  In April 2016 the U.S. Army Corps of Engineers, St. Paul District received $50,000 to initiate a feasibility study.  A federal interest determination was completed in June 2016 and was approved in July 2016.

The feasibility study is nearing completion and has evaluated an array of alternatives designed to stabilize the erosion that is threating County Road M. The feasibility study and the environmental assessment will be completed in spring 2018.  Following the completion of the feasibility study the Corps and Dunn County will work to execute a Project Partnership Agreement (PPA).  PPA execution is expected in the April 2018. Design and implementation can begin after a PPA is executed, depending on funding availability.    


Section 14 of the 1946 Flood Control Act, as amended, Emergency Streambank Erosion or Shoreline Protection.


The first $100,000 of the feasibility study is fully federally funded. Any remaining study costs will be split 50-50 between the federal government and the non-federal sponsors.  It is anticipated the study will be completed for the first $100,000. If a solution is found feasible the design and implementation phase of the project will be cost shared at 65 percent federal and 35 percent non-federal.

Federal funds allocated to date:  $100,000.

Dunn County Highway M St. Paul District Streambank Protection U.S. Army Corps of Engineers