A construction project to replace the Iowa 175 bridge over the Maple River west of Mapleton will close the roadway to traffic beginning Thursday, December 9, weather permitting, according to the Iowa Department of Transportation’s District 3 Office. 

Dixon Construction of Correctionville was awarded the $3.1 million bridge replacement project. The substructure of the bridge is expected to be completed this winter and the bridge deck will be poured in the spring. The anticipated completion date of the project is July 31, 2022. 

Iowa 175 traffic will be detoured on Monona County roads L-32 and E-34. The Iowa DOT will perform winter maintenance on the detour route.