M-85 (Michigan highway)

M-85
Fort Street
M-85 highlighted in red
Route information
Maintained by MDOT
Length	21.882 mi[1] (35.216 km)
Existed	1956[2][3]–present
Tourist routes	Lake Erie Circle Tour
Major junctions
South end	I-75 near Rockwood
Major intersections	I-75 in Detroit
North end	Griswold Street in Detroit
Location
Country	United States
State	Michigan
Counties	Wayne
Highway system
Michigan State Trunkline Highway System Interstate US State Byways
← M-84 → M-86

M-85, also known as Fort Street or Fort Road for its entire length, is a state trunkline highway in the U.S. state of Michigan. The highway serves several Downriver suburbs of Detroit, as well as neighborhoods in the city itself. From its southern terminus at exit 28 on Interstate 75 (I-75) to its second interchange with exit 43 on I-75 in southwest Detroit, M-85 is part of the Lake Erie Circle Tour. In between, it serves mostly residential areas running parallel to a pair of rail lines; the highway carries between 5,000 and 43,000 vehicles per day on average. Once in the city of Detroit, Fort Street runs parallel to I-75 for several miles before they separate near the Ambassador Bridge. The northern end of M-85 is at the intersection with Griswold Street in downtown Detroit, one block away from Campus Martius Park.

Two previous unrelated highways bore the M-85 designation. The first was in Montcalm County and the second near Caro. These uses were retired in the 1930s and the 1940s, respectively. The current M-85 was created in 1956 after the construction of the Detroit-Toledo Freeway; the original northern end was at an intersection with US Highway 25 (US 25) in downtown. The northern end was truncated in the late 1960s to the northern junction with I-75. The highway was then extended back into downtown Detroit in the first year of the 21st century.