 This section was built to alleviate congestion in downtown Marshfield along Central Ave. Further, the city and WisDOT are reconstructing Central Avenue in 2009 before handing it over to city control.WIS 13 heads northwest to Spencer where it turns north to follow the Marathon/Clark county line, passing through Unity, Colby and Abbotsford (where it junctions with WIS 29) and around Dorchester.The highway then enters Taylor County where it passes through Stetsonville and crosses WIS 64 on the east side of Medford.