This report addresses the issue of sediment accumulation in Eau Claire River lake impoundments and assesses the benefits and costs of four different options regarding its removal, along with additional sub-options. The purpose of this planning effort is to provide a reference framework for Eau Claire County to use when estimating the outcomes of each possibility. Data was collected from peer-reviewed scientfic articles, local and historical newspapers, Eau Claire County’s 2023 budget, and interviews with “Friends of” lake rehabilitation groups. Additional information on beach closures was provided by the class of Environmental Science 972.
The key findings of this study show that the most cost-effective method of sediment removal for Eau Claire County to pursue would be Option 3B. This involved managing upland sediment to prevent accumulation downstream while continuing current dredging practices and expanding when possible. This will allow the county to maintain the health and presence of Lakes Altoona and Eau Claire while also considering the recreational and aesthetic benefits of these bodies of water. In the long term, it may be more beneficial in terms of cost and environmental sustainability for the county to consider the removal of one or both main dams along the Eau Claire River. This opon is the most expensive in the short term and will require stakeholder input well in advance of implementation.
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