M-85 is a 21.882-mile-long State Trunkline which overlaps Fort Street in metro Detroit. The Trunkline begins at Interstate 75 in Brownstown Township and ends at Griswold Street in downtown Detroit. Fort Street was completed to current scale during the 1930s as one of Detroit's major radial streets. The segment of Fort Street from Interstate 75 to Oakwood Boulevard was adopted as State Trunkline during 1956. The remaining segment from River Rouge to downtown Detroit is part of the historic alignments of M-10, M-17 and US Route 25. When US Route 25 was decommissioned in Michigan during 1967 the segment carried by Fort Street was transferred to M-85. Part 1; the history of M-85 The Fort Street name is a reference to British fortification of Fort Shelby. Fort Shelby (originally Fort Lernoult) was built during 1779 at what is now the intersection of Fort Street and Shelby Road. The fortification was ceded to the United States in 1796 and renamed to Fort Detroit in 1805. The c
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