work underway on a water-discharge structure we designed for poor soil conditions
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options study for hazardous low-head dam

options study for hazardous low-head dam
client
City of Jackson
location
Minnesota

rock riffles maintain river upstream levels

The low-head Des Moines River Dam needed repair to protect the public from drowning hazards. Barr developed preliminary options with enough detail for the city of Jackson, the Minnesota Department of Natural Resources, and the community to evaluate viability, constructability, and cost. Stakeholder meetings presented the issues and concerns, a preliminary outline of alternatives being considered, and the issues associated with the repair options.

We identified four options that best addressed the community’s concerns and met the DNR and U.S. Army Corps of Engineers’ requirements for fish passage and elimination of the drowning hazard. The city elected to replace the dam with three structures containing rock riffles that would pool water upstream.

Barr prepared the final design and construction documents, and assisted with contractor selection and construction administration. Construction was delayed for two years due to high river flows, but site restoration was completed in 2012.