M-21 Rebuilding/Roundabout Project - St. Johns

The project is scheduled to be let (bids received) in December 2028, with construction taking place approximately from April to November 2029.

MDOT is currently working on designing the roundabout, including the pedestrian crossings. The crossings will connect with the existing shared-use path along Scott Road. MDOT will continue to work with the City of St. Johns on this design.

In the late 2010s, MDOT and the City of St. Johns had multiple discussions about the M-21/Scott Road intersection. There were concerns with speeding and visibility issues due to the geometry of the intersection. In 2021, the City of St. Johns voted to send a resolution of support to MDOT for a roundabout to be built at the intersection.

With the support of the city, MDOT completed a scoping report for a rebuilding project along M-21, including the construction of a roundabout. Additional funding for a roundabout was secured in 2024 due to operational and safety concerns at the intersection.

In late 2025, both the City of St. Johns and Bingham Township passed a resolution requesting MDOT to reconsider the proposed roundabout, to install a traffic signal, and to conduct a traffic study to extend the traffic control further east on M-21. MDOT has completed a comprehensive traffic study to evaluate the M-21/Scott Road intersection for signalization. This study determined that a signal would not be appropriate at this location. MDOT is continuing to evaluate measures that could be implemented to encourage reduced speeds.

A roundabout at this intersection will improve safety and traffic flow. It will also serve as a clear gateway to St. Johns' historic downtown.

This location was studied for a traffic signal, which found that a traffic signal would not be justified at this location due to low traffic volumes.

No businesses will be closed due to this project. Access to nearby businesses will be maintained throughout construction.