Lock and Dam 4 dewatering, winter 2020-2021
Lock and Dam 4 in Alma, Wis., is dewatered in order to conduct maintenance. Major winter maintenance like this occurs about every 20 years and includes concrete repairs, sandblasting and repainting the miter gates and updating the bubbler system used to prevent ice buildup within the lock chamber. Due to the use of heavy equipment and safety requirements, the parking lot and pedestrian bridge are closed during the repairs. The $3.5 million maintenance project is scheduled to be completed mid-March, ahead of the 2021 navigation season.

Contact Public Affairs

U.S. Army Corps of Engineers
St. Paul District
Public Affairs Office
332 Minnesota St., Suite E1500
St. Paul, MN 55101

Phone: (651) 290-5807
Fax: (651) 290-5752