M-17 (Michigan Highway) - History

History

M-17 is an original state trunkline dating back to the 1919 signing of the system. On July 1, 1919, the highway started at M-11 in Berrien County in the southwestern Lower Peninsula and ran east to Detroit. The debut of the U.S. Highway System replaced most of M-17 with two different highways. From Watervliet to Ann Arbor, US 12 replaced M-17; east of Ypsilanti to Detroit, US 112 replaced M-17. The M-17 designation also replaced M-23 on Ecorse Road between Ypsilanti and Lincoln Park and then ran concurrently with US 25 into Detroit. The Ann Arbor segment was rerouted along Boulevard Drive (now Stadium Boulevard) between US 12 and US 23.

A realignment in 1937–38 moved the M-17 designation in Allen Park. Changes made moved the highway to turn east on Southfield Road to US 25 and follow US 25 back to the former routing into Detroit. Another larger change came before 1945 with the completion of the Willow Run Expressway. M-17 was rerouted west of the Wayne–Washtenaw county line along the expressway that replaced Ecorse Road. M-17 was joined by Bypass US 112 (BYP US 112) along the Willow Run Expressway to a southern freeway bypass of Ypsilanti. M-17 continued past the end of BYP US 112 at US 112/Michigan Avenue along a two-lane highway to US 23. It then followed US 23 back to Washtenaw Avenue in Pittsfield Township to rejoin the original alignment of M-17 west to Ann Arbor. The former M-17 through downtown Ypsilanti was redesignated Business M-17 (BUS M-17).

The Michigan State Highway Department (MSHD) completed the freeway bypass of the Ann Arbor–Ypsilanti in 1956, then moved the M-17 designation back to Washtenaw Avenue, Michigan Avenue and Ecorse Road, removing BUS M-17 in the process. US 12 and US 112 replaced the BYP US 112 designation on the freeway. The former US 112 designation through downtown Ypsilanti was converted to a BUS US 112 designation, including sections concurrent with M-17. Another change was made to the Ann-Arbor section of the highway as it was truncated to end at US 23. The 1962 completion of the US 23 freeway through the Ann Arbor area by MSHD moved the western terminus of M-17 west to meet the new freeway at the current terminus. The eastern terminus was progressively scaled back starting in 1968. The US 25 concurrency was removed and the terminus was moved to M-39/Southfield Road in Allen Park. A second truncation scaled the terminus back to US 12, the current eastern endpoint.

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