Phase MI-4 Maple Diversion

urban flood control

The USACE Feasibility Study is a three-year process to

determine if there is a federal interest in any portion of the

MREFPP. The study began in 2016, and with an accelerated

schedule, is on track to be completed in December 2018.

Through this process it was determined that the Maple

Diversion may have the cost-benefit ratio necessary for it

to have a federal interest. The Maple Diversion became the

Federally Preferred Plan and the study continues to move forward.


As a part of the USACE’s Feasibility Study, the design of Phase MI-4 Maple Diversion has been advanced to a 20% design level. Phase MI-4 continues where Phase MI-3 left off and continues northeasterly to tie into the west end of Phase MI-1. Phase MI-4 includes an excavated high flow diversion channel, upstream and downstream river closure structures, an upstream weir structure, earthen levee segments, and closure structures across the Canadian Pacific Railroad and 6th Street.


Both 6th Street and Canadian Pacific Railroad would be realigned as a part of the project and a railroad bridge would be constructed of the diversion channel. Additional features include a shared use path and aquatic recreation opportunities.


The total project cost is estimated at $85 million. If the project is federally authorized and appropriated, the federal share of the cost would be 65% and the state and local share would each be 17.5%.


The Feasibly Study only includes the north side levees of the Maple Diversion. In the future, if the project sponsor wishes to add protection on the south side, it would not be a part of the potential federal project.

Design is approximately 20% complete; configurations will change with final design

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