MDOT to Rebuild and Widen 7.8 Miles of U.S. 31 Near Interlochen in 2026

The Michigan Department of Transportation has scheduled a major reconstruction and widening of U.S. 31 near Interlochen for spring 2026, targeting improved traffic flow and safety along a 7.8-mile corridor. The $32.5 million project includes the construction of a new roundabout at the intersection of South Long Lake Road and J. Maddy Parkway and will proceed in two distinct phases.

Under the planned schedule, tree clearing is expected to begin by March 16, followed by construction preparation activities by April 15, both subject to weather conditions. Work will be carried out in two phases: Phase 1 will rebuild the segment from Sullivan Road to just west of J. Maddy Parkway, including the new roundabout; Phase 2 will continue the improvements eastward to Reynolds Road.

Traffic management is designed to maintain movement while crews work. Eastbound U.S. 31 traffic will be detoured along a route using Gonder Road, Riley Road, J. Maddy Parkway, Youker Road and County Road 633. Temporary traffic signals will be installed at several junctions along the detour to manage increased turning movements and volumes. Westbound U.S. 31 lanes are expected to remain open to traffic throughout both phases, limiting full closures to eastbound traffic only.

Local residents should expect changes to travel patterns and plan additional travel time during the construction window. The detour route uses local and county roads that serve neighborhoods, schools and small businesses; drivers unfamiliar with these roads should proceed with caution and expect temporary signal timing and lane shifts. Businesses near the work zone may experience altered access at times, and emergency response routing will likely require brief adjustments during active construction periods.

The project represents a significant investment in regional transportation infrastructure and reflects continued statewide emphasis on improving safety and capacity on primary routes into northern Michigan. For the most current detour maps, construction schedules and traffic advisories, residents and commuters are advised to consult MDOT’s project website, which will carry up-to-date notices as work progresses.