M-28 Business (Ishpeming–Negaunee, Michigan)

Business M-28 (Bus. M-28) is a state trunkline highway serving as a business route that runs for approximately 4.9 miles (7.9 km) through the downtown districts of Ishpeming and Negaunee in the US state of Michigan. The trunkline provides a marked route for traffic diverting from U.S. Highway 41 (US 41) and M-28 through the two historic iron-mining communities. It is one of three business loops for M-numbered highways in the state of Michigan. There have previously been two other Bus. M-28 designations for highways in Newberry and Marquette.

The trunkline was originally a section of US 41/M-28 and M-35. Before the 1930s, the main highways ran through the two downtown areas when US 41/M-28 was relocated to run near Teal Lake. The former routing had various names over the years. It was designated as an alternate route of the main highways, using both the US 41A/M-28A and Alt. US 41/Alt. M-28 designations before it was designated as Bus. M-28 in 1958. M-35 continued to run through downtown Negaunee along a section of the highway until the 1960s. A rerouting in 1999 moved the trunkline designation along Lakeshore Drive in Ishpeming, and a streetscape project rebuilt the road in Negaunee in 2005.