History & Heritage


394377 - Coon Rapids Dam – Stopping Invasive Carp Starts a Renewed Interest in Hydropower

Monday, June 4
2:00 PM - 3:30 PM
Location: Greenway CD

Coon Rapids Dam was built for hydropower in 1910 and spans across the Mississippi River just north of the Twin Cities. After 50 years, hydropower was decommissioned and the dam led a quiet existence until the large, high jumping invasive silver carp were spotted in nearby Lake Pepin. Coon Rapids Dam is the only appreciable dam that separates Lake Mille Lacs (large million dollar walleye fishery) from the northern Twin Cities. As a result, repurposing the dam as a physical barrier to Asian carp was included in the recent spillway project. This project also increased the hydropower potential and redevelopment is currently under review.
The purpose, need, and potential benefit or harm from a dam shifts over time. This presentation will cover the history of Coon Rapids dam: its construction, the shift towards recreational purposes, the discussion for potential removal, the rehabilitation to serve as a barrier to invasive carp, and finally back to its original purpose as a source of “renewable” hydropower. Stanley Consultants has served as design engineer for major rehabilitation projects at Coon Rapids Dam since the mid-1990’s so has a long history with the dam, its design issues, and its function for the surrounding region.

Bill Holman


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Andrew Judd, PE, CFM

Senior Water Resources Engineer
Stanley Consultants

Andrew Judd is a senior water resources engineer with Stanley Consultant's Minneapolis office. During his 17 years as a consultant engineer he has had the opportunity to work on a wide variety of stormwater, water resources management, and restoration projects for public and private sector clients. He enjoys working on unique and complex projects that involve water resources but include multiple perspectives, disciplines, and objectives. He has a B.S. in Civil Engineering from the University of Wisconsin and an M.S. in Environmental and Water Resources Engineering from the University of Texas. Andrew is a Certified Floodplain Manager and is involved with the MN Association of Floodplain Managers. His current projects are focused on stream and wetland restoration, dam rehabilitation, and flood risk reduction.


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394377 - Coon Rapids Dam – Stopping Invasive Carp Starts a Renewed Interest in Hydropower

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