M-147 (Michigan)

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M-147 highlighted in red
Route information
Maintained by MDOT
Length0.505 mi[1] (813 m)
Existed1936[2][3]–January 5, 1991[4]
Major junctions
West end M-106 near Jackson
East endState Prison of Southern Michigan
CountryUnited States
Highway system
M-146 M-149

M-147 was a state trunkline highway in the U.S. state of Michigan. The route started at M-106 just north of Jackson and stopped at the entrance of State Prison of Southern Michigan. The route of M-147 was transferred to local control in 1991 after being signed originally in 1936.

Route description

M-147 started at an intersection with M-106 west of the State Prison of Southern Michigan property. From there, the trunkline ran about a half mile (0.8 km) due east to the prison gate and terminated. Just east of the terminus was a branch line of the Grand Trunk Western Railroad.[5] In 1976, a newspaper article said that "it's ... the second shortest highway on Michigan's state highway system, but for those who travel it one way, M-147 is the longest road in the world" in discussing its role as the connection to the state prison,[6] the world's largest walled prison.[7] Another in 1972, called it a "snippet of highway" that "most people hope they never have to travel" in a profile of short highways to "important places".[8]


M-147 was designated in 1936 to connect the prison property with the state trunkline system.[2][3] It would remain under state control until January 5, 1991 when it was turned over to Jackson County.[4]

Major intersections

The entire highway was in Blackman Township, Jackson County.

0.0000.000 M-106
0.5050.813State Prison of Southern Michigan front gate
1.000 mi = 1.609 km; 1.000 km = 0.621 mi


  1. ^ a b Michigan Department of State Highways and Transportation (July 1, 1978). Control Section Atlas (Map). Scale not given. Lansing: Michigan Department of State Highways and Transportation.
  2. ^ a b Michigan State Highway Department & Rand McNally (December 1, 1935). Official Michigan Highway Map (Map). [c. 1:850,000]. Lansing: Michigan State Highway Department. § M11. OCLC 12701143.
  3. ^ a b Michigan State Highway Department & Rand McNally (June 1, 1936). Official Michigan Highway Map (Map). [c. 1:850,000]. Lansing: Michigan State Highway Department. § M11. OCLC 12701143.
  4. ^ a b State Administrative Board (February 20, 2007). "State Administrative Board Resolutions, 1940–Present". Lansing: State of Michigan. p. 49. OCLC 85834636. Retrieved January 1, 2023 – via Library of Michigan Digital Repository.
  5. ^ United States Geological Survey (1976). Jackson North Quadrangle (Map). 1:24,000. Reston, Virginia: United States Geological Survey. Retrieved May 24, 2011 – via Archive.org.
  6. ^ "The Long & Short of State Highways" (PDF). Easy Livin'. Gaylord Herald Times. July 30, 1976. p. 6. OCLC 38114298. Archived from the original (PDF) on August 10, 2011. Retrieved June 3, 2011.
  7. ^ "The Long and Short of State Highways". Livingston County Press. Howell, Michigan. July 28, 1976. p. 3C. OCLC 35423811. Retrieved March 4, 2023 – via Newspapers.com.
  8. ^ "Just Smidgins of Highways". Lansing State Journal. April 17, 1972. p. B1. ISSN 0274-9742. Retrieved October 10, 2022 – via Newspapers.com.

External links

  • M-147 at Michigan Highways