Business Loop I-94 - Port Huron

Business Loop I-94 was established by 1987 with 9.15 miles (Bessert, 2026) over the trunkline highway of M-25 north from Exit 266 to the Bluewater Bridge (I-69/94) at Exit 274. Gratiot Boulevard angles the business route northeast along a commercial arterial from I-94 to M-29 (Busha Highway) within the city of Marysville. The trunkline highway proceeds north along the St. Clair River from there to separate into a couplet of Military Street north and Electric Avenue south through southern Port Huron.

The one-way pair of Business Loop I-94 converges at Vanderburg Place as Military Street. The route advances north 0.7 miles to merge with Business Loop I-69 at Oak Street. Business Loop I-69 follows Griswold Street west, while the route north overlaps with Business Loop I-94 to Downtown via Huron Avenue and M-25 via Pine Grove Avenue.