East of this junction, US 12 and WIS 312 overlap for 2.6 miles (4.2 km) past the Wild Ridge and Mill Run golf courses to the northwestern limits of the city of Eau Claire.

WIS 312 travels another 2.4 miles (3.9 km) through the northern edge of Eau Claire, crossing over the Union Pacific, Altoona subdivision railroad tracks, before reaching the bridge over the Chippewa River.

After crossing the river, WIS 312 passes under the Union Pacific, Chippewa Falls subdivision railroad tracks and comes to an interchange with North Hastings Way, a former alignment of US 53.

About 1.3 miles (2.1 km) east of the North Hastings Way junction, WIS 312 comes to an end at an interchange with US 53 at exit 90 just outside Eau Claire in the town of Seymour.

[1] The North Crossing highway, serving as an alternative to I-94 bypassing downtown Eau Claire, was opened to traffic in 1994.

This resulted in the shortening of WIS 124 to a length and routing nearly identical to that it had in 1992 before it was extended to cover the then-new North Crossing in Eau Claire.