Junction Falls Dam Rehabilitation—New Design Incorporates Vintage Concept

by Frederick Lux, III, Ayres Associates, Eau Claire, United States,

Document Type: Proceeding Paper

Part of: Waterpower '91: A New View of Hydro Resources


Junction Falls Dam was constructed in a gorge of the Kinnickinnic River in 1920 to produce hydroelectric power for the city of River Falls, Wisconsin. In 1988, the River Falls Municipal Utility received a Federal Energy Regulatory Commission (FERC) license to operate and sell power generated by the hydroplant contingent upon Junction Falls Dam meeting current dam safety criteria. The dam was found to have inadequate spillway capacity and also did not meet current FERC stability criteria. The utility had previously recognized that the Junction Falls Dam needed repair due to deteriorating exposed concrete surfaces and unstable downstream abutments from undercutting. This paper describes some techniques used to rehabilitate Junction Falls Dam, including the use of a stepped spillway and post-tensioned rock anchors.

Subject Headings: Hydro power | Rivers and streams | Occupational safety | Dams | Rehabilitation | Conceptual design | Concrete dams | Earthfill dams | Wisconsin | United States

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