Shiny new dam in Wisconsin

Posted in: Energy, Water

dam under construction Lately, we’ve seen a national trend of dams being eliminated after they reach the end of their useful life. This is due to multiple factors including environmental concerns, costs of rehabilitation, permit restrictions, and public opinion. While many of these removals are justified not many dams are re-built. That’s why the state-owned Little Falls Dam project, located at the Willow River State Park near Hudson, Wisconsin in St. Croix County is so exciting.

The original high-hazard dam was constructed in 1892. While it had undergone numerous improvements throughout the years, it did not have adequate spillway capacity and there were safety concerns related to the structure. For these reasons, the dam was intentionally breached in the fall of 2015.

The Wisconsin Department of Natural Resources (WDNR) undertook a strategic alternatives analysis, which included public opinion solicited from local residents and public user groups. The park is one of the most highly attended in Wisconsin, and the reservoir created by the dam is an important draw to the park. After an extensive alternative analysis considering alternatives for removal, repair, and replacement, the DNR decided to replace Little Falls Dam.

After a Quality Based Selection process (QBS), Mead & Hunt was awarded the design along with construction administration. The design needed to pass the 1,000-year flow (Q1,000), provide a cold water draw for fish habitat, minimize the need for park personnel to operate the gates, control the release of the sediment downstream, and minimize the impact on the landscape.   

Mead & Hunt completed the design of the 26-foot-high dam in the spring of 2016. The concrete dam consists of an overflow spillway, crest gate spillway, intake tower and non-overflow structures. The bids came in under the available budget, so the project moved forward. The dam is scheduled to be completed this winter while the reservoir is scheduled to be refilled in the spring of 2020. You can view the live construction of this project here.

This is a unique and rewarding project to be a part of and the entire construction team is anxiously awaiting its completion. The new dam will provide a lake for swimming, canoeing, kayaking, and fishing in the scenic Willow River State Park for future generations to enjoy.

Marty Kemps

About the Author

Marty Kemps, PE, is a senior engineer and client manager with nearly 20 years of geotechnical and project management experience. He has served as project manager for upgrades to existing dams, new dams and has performed numerous safety inspections along with construction administration oversight. When not working on dams and hydroelectric projects, Marty enjoys motorcycling and skiing.

Read more posts by Marty Kemps

One response on “Shiny new dam in Wisconsin

  1. Congratulations on the Little Falls project. This project sounds so similar to our project at Clam Falls Flowage Dam which is owned by Northwestern Electric (NWE) Grantsburg , WI. The owners have offered to give the dam along with $650,000 to either the township or the county but both have turned down the offer. Our community has formed a Lake Association to join forces and have one voice in trying to save the dam. We would love to talk with you regarding the possibility of repairing/replacing Clam Falls Flowage dam. Cost of course is the biggest challenge. NWE current plan is to start draw down as soon as ice is out this spring. Thank you. Jackie Moody CFFLA Vice President.

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