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Mon-Maq Dam removal assessment and process design

About this project

client
Jones County Conservation Board
location
Iowa
cost
$1 to $2 million (est.)
completion date
Ongoing

No longer in use, Mon-Maq Dam on the Maquoketa River generated hydroelectric power until the 1960s. In partnership with the Iowa Department of Natural Resources, Iowa Department of Transportation, and the U.S. Fish and Wildlife Service (USFWS), Jones County retained Barr to evaluate dam removal options in order to mitigate safety risk and improve both the river’s ecology and recreational opportunities.

Barr collected site data by performing bathymetric mapping, topographic surveying, and sediment probing; initial wetland delineation; and cultural resources, architectural, and archaeological investigations required by the National Environmental Policy Act (NEPA). We developed conceptual designs and base maps and facilitated public meetings to gain stakeholder input and reaction to options being considered.

The work’s next phase involved hydrologic analysis and hydraulic modeling, evaluation of potential project impacts, investigation of removal methods, and preliminary design. Barr also assessed potential for sediment transport, completed detailed wetland delineation, and performed additional archaeological investigation. We advanced the design and dam removal process along with conservation measures to improve fish passage. Currently, we’re working with the USFWS to prepare an Environmental Assessment and participating in stakeholder and public meetings as part of that process. Construction is anticipated to begin in 2020.

Key team members

Matt Peterson

Senior Civil Engineer

Tom MacDonald

Vice President
Senior Water Resources Engineer

Jon Ausdemore

Vice President
Senior Civil Engineer

Brian Burgner

Senior Ecologist

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