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Evaluation of Environmental Impacts in the St. Clair River from Potential Restoration Structures

Scudder Mackey;
An exploratory investigation of the upstream and downstream environmental effects of restoring water levels in Lakes Michigan and Huron using permanent structures constructed in the St. Clair River. Based in part on a parallel study involving a review of existing engineering design plans from prior studies to examine the potential structural options that could be used to permanently reduce the conveyance capacity of the St. Clair River, including the installation of submerged sills in the upper St. Clair River and dikes to obstruct flow in the eastern channels at Stag and Fawn Islands. Existing ecological information and data on the St. Clair River were summarized to assess potential environmental impacts of proposed Lake Michigan-Huron water level restoration scenarios. A complimentary workshop was also held to further explore important environmental issues and concerns related to the placement of structures on the bed of the St. Clair River.
Ecological Impacts of St. Clair River Restoration Structures
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Supporting Content (Show)
Main Topics
Water Level Restoration
Multi-Lake Regulation
Questions We Asked
Can restoration of Michigan-Huron levels address extremes?
Can multi-lake regulation address extremes?
Key Findings
Ecosystem impacts of restoring Michigan-Huron levels would be mixed
Potential for multi-lake regulation to address extremes is limited
Multi-lake regulation should not be pursued
Remedial measures should not be taken in the St. Clair
Ecosystems Evaluation