Maintenance repairs will close part of one of the viaducts in Superior on Thursday.  Officials with the City of Superior are warning drivers about a daytime closure of the west-bound lane of the 21st Street Viaduct on June 22 between the hours of 7:00 AM and 3:00 PM.

During the closure, city road crews will be working to repair the expansion joints. Detour signs will be posted in advance to alert drivers and suggest alternate routes.

East-bound traffic will not be affected by the closure.