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By Joe Block 

Two-year construction project begins at Prairie du Sac Dam


June 28, 2018

Joe Block

The Prairie du Sac Dam releases water after heavy rains last week. The two-year construction project will begin by closing the gates in the foreground. Temporary dams will be installed and each gate will be lifted.

Alliant Energy has plans to update the Prairie du Sac dam with a project expected to be completed by the fall of 2020.

The dam sits on a foundation of several thousand wood pilings, driven into the sandy river bottom. The wood pilings have proven to be extremely durable through the 107-year history of the dam. However, times of low water expose the uppermost part of the pilings to the air. As long as the pilings remain submerged, they won't rot. When periodically exposed to air, they can weaken.

There is jo short-term issue with the pilings. Alliant is looking into the future to maintain th...

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