WIS 441 Tri-County Freeway

The US 10/I-41/WIS 441 System Interchange is one of the busiest interchanges in northeast Wisconsin. First built in the mid-1970s, it connected U.S. Highway 41 — now Interstate 41 — to the new State Highway 441 freeway crossing of Little Lake Butte Des Morts to the east.

In the late 1990s, US 10 was realigned to approach the interchange from the west. Designs were then drawn up in the early 2000s to add two more ramps. These plans hit a road bump, though, when it was discovered the functional layout had been approved as part of an environmental assessment that had to be revised in light of current and expected traffic demand and new design standards.

Tri-County Partners — a joint venture among Kapur, HNTB and AECO — worked with WisDOT to oversee the designs of the new WIS 441 Tri-County Freeway projects. The team collaborated with WisDOT’s Northeast Region staff to identify accommodations for the increased traffic demand. The revisions called for adding an auxiliary lane to I-41 northbound between County Highway II and State Highway 441; adding a through lane and an auxiliary lane to I-41 southbound between County Highway II and State highway 441; switching one ramp from having a standard right-hand exit to a left-hand freeway split; and realigning US 10/WIS 441 westbound to accommodate the split.