Mosinee to Merrill

WIS107 in downtown Marathon City

WIS 107 heads due north from WIS 153 into the village of Marathon City, where it becomes Main Street. Crossing the Big Rib River, it meets up with WIS 29 at the latter's exit 156.

WIS 107 continues north into the unincorporated community of Little Chicago. About two miles north of the Marathon/Lincoln County line, it intersects with Wisconsin Highway 64 and continues north, then east, with WIS 64 towards Merrill.^[2]

Merrill

Entering Merrill, WIS 107 and WIS 64 run alongside the banks of the Wisconsin River, across from Council Grounds State Park. After briefly running through the city of Merrill's Sixth Ward along West Main Street, the two highways cross over the Wisconsin River—twice. The river is divided by a small island where West Main Street crosses into the uptown portion of the city of Merrill.

The two highways separate at the Y-intersection of Grand Avenue and Main Street; WIS 64 continues east over the Prairie River into downtown Merrill, while WIS 107 turns sharply to the northwest along Grand Avenue.

WIS 107 continues northwest, past the Merrill Area Recreation Complex and the main entrance to Council Grounds State Park, before turning north out of the city.^[2]

Merrill to Tomahawk

Northern terminus by Tomahawk

North of Merrill, WIS 107 runs along the eastern banks of the Wisconsin River as a rural two-lane highway all the way to its northern terminus with County Trunk Highway S (CTH-S) outside of Tomahawk.^[2] The terminus is somewhat unusual, as state highways in Wisconsin normally end at another state trunk highway. CTH-S, however, was the former route of US Highway 51 (US 51) as it entered Tomahawk. When the US 51 bypass freeway was finished east of the city, the former route of US 51 was turned back to county control, resulting in the unusual terminus.