Business Spur I-75 - Bay City

Business Spur I-75 east in Downtown Bay City, MI — Business Spur I-75 (McKinley Street) east ends as M-25 intersects M-84 (Washington Avenue) in Downtown Bay City. A trailblazer directs motorists onto M-84 north for the westbound beginning of the business spur on 7th Street. Photo by Walter R. and William Stasinowsky (02/01).

Business Spur I-75/M-25 west in Bay City, Michigan — Business Spur I-75 and M-25 reassurance markers on Jenny Street west in Bay City, Michigan. Photo by Walter R. and William Stasinowsky (02/01).

Business Spur I-75 west at I-75/US 23 and US 10 — Business Spur I-75/M-25 conclude at the cloverleaf interchange with I-75/U.S. 23 as the freeway transitions into the westbound beginning of U.S. 10. Photo by Walter R. and William Stasinowsky (02/01).

Business Spur I-75 stems east from Exit 162 along M-25 to Downtown Bay City. The 3.05 mile long route links I-75 with the couplet of Thomas Street east and Jenny Street west via a limited access highway. The one way pair recombine at the Veterans Memorial Bridge across the Saginaw River. Business Spur I-75 separates again from the span to end at M-84 (Washington Street) along a two block section of McKinley Street east and 7th Street west.

Guide signs along I-75/U.S. 23 omit Business Spur I-75 for Exit 162 and only display M-25. The full cloverleaf interchange doubles as the east end of U.S. 10.

Prior to 1971, Bay City was served by a full Business Loop from I-75. The loop branched northeast from Exit 160 along Saginaw Road to Salzburg Avenue. Salzburg Avenue extended the route east across the Saginaw River to Lafayette Avenue and Garfield and Washington Avenues turned the loop north to the current east end of Business Spur I-75. This was all redesignated as a northern extension of M-84.

Updated August 1, 2026