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M-151 was a state highway designation that served two routings. The first was a connector route from US 112 to Niles along previous county along the routing of today's US 12. It started at the junction of today's US 12 and OLD M-205. The second was formed in 1935 from US 223 to US 25 in southern Monroe County. At this time, the first M-151 is replaced by an extended US 112. The second M-151 was turned back to Monroe Conty between US 23 and US 25 in November 1951. The rest was replaced by a rerouted US 223 to US 23 in 1977.[1]
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