Michigan Highways: Since 1997.

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Former M-2
M-3 Route Marker On to Next Route:
Former M-4
Southern Terminus:   Jct M-10 & BS I-375 (cnr Randolph St & Jefferson Ave) in downtown Detroit.
Northern Terminus:   Jct I-94 & M-29 at Exit 243 in Chesterfield Twp west of New Baltimore.
Length: Updated 27.238 miles
Map: Route Map of M-3
Notes: Known as Gratiot Ave for most of its length. Before 1972, this route was a portion of US-25 in Michigan.
  Until 1998, the northernmost 3½ miles of M-3 were concurrently designated with M-59. However, with the completion of the M-59/Hall Rd upgrade, the M-59 designation was transferred from Gratiot Ave & 23 Mile Rd onto the portion of Hall Rd east of Gratiot to I-94. Gratiot and 23 Mile Rd north of Hall Rd is now designated only as M-3.
History: 1972 - With the removal of US-25 from the state of Michigan, the former route of US-25 from Detroit to Chesterfield Twp along Fort St, Gratiot Ave and 23 Mile Rd is redesignated as M-3.
  1981 (Jan 28) - The former route of Sbd M-3 through downtown Mount Clemens via Welts Ave and Gratiot Ave (from Welts southerly to halfway between Robertson & Kibbee Sts) is turned back to local control after a new westerly bypass of the downtown district is completed. Sources indicate the new relocation of Sbd M-3 opened the previous year, however. The former route of Sbd M-3 along Gratiot Ave is also renamed Main St by the City of Mount Clemens.
  1998 - The final portion of the M-59 upgrade is completed and the concurrent M-59 designation is removed from M-3 north of Hall Rd, leaving the M-3 designation as the sole route number there.
  2001 (Mar 15) - During a spate of jurisdictional transfers in the City of Detroit, which included several former state trunklines in the Campus Martius area of downtown being transferred back to City of Detroit control, M-3 is actually severed into two discontinuous portions. The two blocks of Cadillac Sq from Woodward Ave to Randolph St designated as part of M-3, as well as Fort St between Woodward and Griswold St, are transferred to the City of Detroit. (Please see the jurisdictional transfer maps linked under "Weblinks" below.) This leaves two issues, solved thusly:
  • The discontinuous segment of M-3 along Fort St from Griswold St westerly to Clark St, then northerly on Clark St to the I-75/Fisher Frwy is redesignated as part of M-85. This is possible as MDOT also assumes control of Fort St from Clark St southwesterly to the former northern terminus of M-85. The one block stretch of former M-3 from Fort St to I-75 is an unsigned state trunkline connector.
  • Since M-3 has been truncated to the cnr of Cadillac Sq & Randolph St and since Randolph St from Cadillac Sq southerly to M-10/BS I-375/Jefferson Ave is an unsigned state trunkline connector, the M-3 designation is simply extended southerly via Randolph to end at Jefferson.
Controlled-Access: No portion of M-3 is freeway or expressway.
NHS: Updated The entire length of M-3 is part of the NHS. (The segment of M-3 from its southern terminus at BS I-375/Jefferson Ave and the I-75 connector ramps northeast of downtown was added in 2012 with the passage of the MAP-21 funding and authorization bill.)
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