US-31 rebuilding, detour near Interlochen could begin as early as April 7

TRAVERSE CITY, Mich. - The Michigan Department of Transportation's (MDOT) project to rebuild a 7.8-mile section of US-31 from Sullivan Road in Green Lake Township, Grand Traverse County, to Reynolds Road in Inland Township, Benzie County, requiring detours on local roads, could begin as early as Tuesday, April 7.

This phase of construction was scheduled to begin April 13, but may begin earlier to take advantage of favorable weather conditions. An early start is dependent on seasonal weight restrictions being lifted on Grand Traverse County roads.

This $32.5 investment includes rebuilding and widening the road to improve pavement condition and provide safety improvements with the addition of center left-turn lanes, widened paved shoulders and rumble strips. The South Long Lake Road/J. Maddy Parkway intersection will be rebuilt as a roundabout.

Counties:
Grand Traverse and Benzie

Highway:
US-31

Closest community:
Interlochen

Estimated start date:
Tuesday, April 7, 2026

Estimated end date:
Friday, Nov. 13, 2026

Traffic restrictions:
April - June: The north side of US-31 will be rebuilt between Sullivan Road and west of J. Maddy Parkway/S. Long Lake Road, including building a roundabout. Southbound US-31 traffic will be maintained on US-31, while northbound US-31 traffic will be detoured on Gonder Road, Riley Road, J. Maddy Parkway, Youker Road and County Road 633.

J. Maddy Parkway access to US-31 will be maintained for most of this phase of construction, though it will be closed for up to two weeks at the start of work while crews build temporary lanes around the roundabout. South Long Lake Road access to US-31 will be closed, with traffic detoured on West Silver Lake Road and Secor Road.

• June - July: The south side of US-31 will be rebuilt between Sullivan Road and west of J. Maddy Parkway/S. Long Lake Road, including building the roundabout. Southbound US-31 traffic will be maintained on US-31, while northbound US-31 traffic will be detoured on Gonder Road, Riley Road, J. Maddy Parkway, Youker Road and County Road 633.

J. Maddy Parkway access to US-31 will be closed for most of this phase of construction. South Long Lake Road access to US-31 will be open to southbound US-31 traffic only, with other traffic detouring on West Silver Lake Road and Secor Road.

• July - November: Rebuilding US-31 from west of the South Long Lake Road/J. Maddy Parkway roundabout to Reynolds Road. Southbound US-31 traffic will be maintained on US-31, while northbound US-31 traffic will be detoured on Reynolds Road, Cinder Road, Diamond Park Road, Gonder Road, Riley Road and J. Maddy Parkway.

Visit MDOT's project website for detour route maps.

Jobs numbers:
Based on economic modeling, this investment is expected to directly and indirectly support 275 jobs.

Safety benefit:
This project will improve safety for all users of the highway with the introduction of a new roundabout, a center-left turn lane and widened paved shoulders.