Michigan Highways: Since 1997.

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M-18
M-19 Route Marker On to Next Route:
M-20
Southern Terminus:    I-94 at Exit 247, 1.7 miles south of New Haven
Northern Terminus:    M-142 three miles east of downtown Bad Axe
Length: 83.80 miles
Map: Route Map of M-19
Notes: Prior to the debut of the US Highway system, M-19 began in downtown Detroit and ran northeasterly out of the city on Gratiot Ave all the way to Port Huron. From there, M-19 backtracked westerly with M-21 to Goodells, then northwesterly and northerly through Yale, Sandusky and Ubly to M-31 (present-day M-142) three miles east of Bad Axe. From there M-19 ran westerly into Bad Axe, then due northerly to end in Port Austin at M-27 (present-day M-25). Portions of that route later became US-25, M-136, M-142 and M-53. Today, M-19 uses much of its pre-1925 routing, specifically from Yale to M-142.
  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 suggested realigning M-19 onto a new highway routing from Muttonville (where M-19 met US-25/Gratiot Ave southeast of downtown Richmond on the Macomb/St Clair Co line) southeasterly to an interchange with the I-94/US-25 freeway at the present-day Meisner Rd overpass. In the end, this new alignment was never built and M-19 was extended southwesterly along Gratiot Ave to replacing US-25 to New Haven, then southeasterly along New Haven Rd to the newly completed I-94/US-25 freeway.
History: 1920s For details on M-19's pre-1926 routing, see the first note above.
  1926 With the coming of the US Highway system in 1926, the first 56 miles of what had been M-19 from Detroit to Port Huron were redesignated as part of US-25. M-19 was then realigned to run on a more direct course southerly from Yale through Emmett and Memphis, ending at the new US-25 near Richmond. The former concurrent segment along M-21 from Port Huron to Goodells retains the M-21 designation, while the portion from Goodells northerly to Avoca, then northwestely toward Yale was turned back to local control. On its northern end, M-19 is scaled back from Port Austin to end at M-83 (present-day M-142) three miles east of Bad Axe. The former route of M-19 into Bad Axe now becomes M-83, with the segment from Bad Axe to Port Austin redesignated as part of M-29.
  1955 The concurrent M-19/M-90 segment south of Peck is shortened by two miles with a realignment of M-90 between Brown City and M-19.
  1958 The final 10-mile gravel-surfaced segment of M-19, from Elmer to Argyle, is paved.
  1963 The M-19 designation is extended southerly from Muttonville (southeast of downtown Richmond) along Gratiot Ave (formerly US-25) to New Haven, then southeasterly along New Haven Rd to the newly completed I-94/US-25 freeway.
Controlled-Access: No portion of M-19 is freeway or expressway.
NHS: New! M-19 is part of the NHS along its concurrent run with M-46 in Sanilac Co from the west jct of M-19 & M-46 west of Sandusky to the east jct of M-19 & M-46 in downtown Sandusky. (5.0 miles) (This segment was added in 2012 with the passage of the MAP-21 funding and authorization bill.)
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