Michigan Highways: Since 1997.

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M-14
M-15 Route Marker On to Next Routes:
Historic US-16 & M-16
Southern Terminus:    US-24/Dixie Hwy just south of Clarkston
Northern Terminus:    M-25 in eastern Bay City (cnr Center Ave & Tuscola Rd)
Length: 69.67 miles
Map: Route Map of M-15
Notes: From the Ortonville area north to Bay City, M-15 has been designated as a Recreational Heritage Route by MDOT. Communities along the route of M-15 promote the route as a scenic alternative to I-75 from Metro Detroit northerly to the Tri-Cities area, in order to capture some of the abundant tourist traffic heading north along that major corridor. Unfortunately, M-15 is in need of upgrading from Clarkston to Davison, and traffic can sometimes be very heavy along the route.
  New! Regarding the Heritage Route, MDOT states: "From Clarkston to Bay City, Michigan’s very first Recreational Heritage Route parallels I-75, offering motorists pleasant surprises and a welcomed diversion from fast paced freeway travel. Clarkston kicks things off at the south end with its summer festivals, parades and outdoor concerts. There’s plenty of camping, fishing and hiking to do along the 85-mile route. Just a few miles from Millington is the Murphy Lake State Game area, a great source of hunting land, trails, lakes and streams. The route concludes just east of downtown Bay City, where marinas, museums, galleries, a lighthouse and a magnificently restored city hall await travelers." The name of this route has evolved into the Pathway to Family Fun Recreational Heritage Route.
  A 1933 highway map shows a proposed M-15 highway running southerly from Clarkston through southern Oakland Co, passing Farmington to the west and skirting Northville and Plymouth to the east, through Belleville to the Wayne/Monroe Co line. This proposed highway would have served as a western bypass of the Detroit area. While the entire highway was not built and M-15 never ran south from Clarkston, much of this proposed road was actually built from Pontiac Tr near Walled Lake souterly through southern Oakland Co and most of Wayne Co—today's Haggerty Hwy. The general route of Haggerty Hwy became, 45 years after it was first proposed, part of the I-275 corridor.
  New! In "State Trunkline Needs, 1960–1980," a set of maps prepared by the State Highway Dept's Office of Planning, Programming Division in 1960 showing possible additions, upgrades and improvements to the state trunkline system over the ensuing twenty years, MSHD staff recommended only one change to the route of M-15 as it existed in 1960. At Bay City, the State Highway Dept was in the process of extending M-15 to run concurrently with M-25 from its previous (and present-day) northern terminus westerly to the new I-75/US-10/US-23 freeway west of the city. The planners recommended diverting M-15 off its existing path as it approached Bay City to run westerly via Young's Ditch Rd/22nd St and Lafayette Ave to Garfield Ave. Until 1960, Garfield Ave north from Lafayette Ave and Lafayette west from Garfield had been signed as BUS US-23, but with the completion of the I-75/US-10/US-23 freeway north from Saginaw, the Garfield-Lafayette route was in the process of being redesignated as part of BL I-75 (a complete loop). Therefore, it's not clear if the recommendation was to then route M-15 northerly along BL I-75/Garfield-Washington Aves into downtown Bay City where it would turn left and continue as BL I-75/M-15/M-25 to the freeway, or to continue westerly with BL I-75 (now M-13/M-84) across the Lafayette St Bridge before turning north to continue with M-13 (formerly US-23) up Euclid Ave to BL I-75/M-25 and then west to the freeway. The existing segment of M-15 between Young's Ditch Rd and M-25/Center Ave was to have been turned back to local control. In any event, the change was never implemented.
History: 1920 Prior to the creation of the US Highway system, M-15 runs along the general alignment of present-day US-41 from Wisconsin at Menominee, through Escanaba, Gladstone, Marquette, Ishpeming, L'Anse, Houghton and Hancock, ending at Copper Harbor.
  1925 As originally proposed in 1925, M-15 was scheduled to be replaced by three different US Highways in four segments. From the Wisconsin line to Powers, M-15 was to be designated US-41, while from Powers to Rapid River, it was to become part of US-2. From Rapid River to Covington, M-15 was proposed to be designated US-102, while the remainder from Covington to Copper Harbor was to be, again, part of US-41.
  1926 Unlike what was proposed in 1925, the final US Highay replacement for M-15 in Michigan was decided to be solely US-41 throughout. The M-15 designation is removed from that route and almost immediately transferred to a new state trunkline routing in the Lower Peninsula. This new highway begins at US-10 (present-day US-24) in Clarkston and proceeds northerly through Davison and Otisville, ending at M-38 & M-24 in Vassar.
  1934 In late-1934, the M-15 designation is extended northwesterly along M-24 to M-25/Center Ave in Bay City, then westerly co-signed in a rather cumbersome triple-concurrency as M-15/M-24/M-25 through downtown Bay City and further west as a bizarre four-way concurrent US-23/M-15/M-24/M-25/Midland St to end at Euclid Ave on the west side of the city.
  c.1937 By 1937, the northern termini of both M-15 and M-24 were scaled back to end at M-25/Center Ave in eastern Bay City. The 1937–1959 routing of M-15 was, ironically, identical to its 1970–present routing.
  1941 The concurrent M-24 designation is removed from M-15 when M-24 is realigned to end in Caro instead of Vassar.
  1959 The M-15 designation extended from its northern terminus at M-25/Center Ave in Bay City westerly concurrent with M-25 and BUS US-23 to US-23/Euclid Ave (present day M-13), much as it had from 1934 to 1937.
  1960 The M-15/M-25 designation is extended westerly from M-13/Euclid Ave to the newly completed I-75/US-23/US-10 freeway west of Bay City.
  1970 After only a decade running concurrently with M-25 through downtown Bay City, M-15 is once again scaled back to its pre-1959 terminus in Bay City at M-25/Center Ave.
  1996 Much of M-15 is designated as a Recreational Heritage Route.
Controlled-Access: No portion of M-15 is freeway or expressway.
NHS: Updated M-15 is part of the NHS from its southern terminus at US-24/Dixie Hwy near Clarkston to Flint St in downtown Davison, east of Flint. (23.2 miles) (The segment from I-75 at Exit 91 north to Davison was added in 2012 with the passage of the MAP-21 funding and authorization bill.)
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