This page consists of a year-by-year history of US-25, including route
realignments, business connections, bypasses and other changes to the route.
|After intially been left out of the system, the new Toledo-Detroit-Port
Huron U.S. Highway is designated US-25. The new highway takes the following
|The Detroit City Council approves the request made jointly by Grover C Dillman, State Highway Dept engineer, and John W Reid, commissioner of public works, to erect route markers on the various streets in downtown Detroit carrying the new U.S. Highway routes. US-25 is to be marked along Oakwood Blvd from the west city limit of Detroit easterly to Fort St, then east along Fort St into downtown to City Hall. From there, US-25 will be posted along Cadillac Square to Randolph St, Randolph St to Gratiot Ave, then northeasterly along Gratiot to the east city limit.|
|c.1930||The route of Toledo Hwy/Dix Hwy from the intersection of US-24/Telegraph Rd & West Rd to Oakwood Blvd southwest of Detroit is completed and opened to traffic as part of US-25. The former route via US-24 and M-17 retains those designations.|
|1931–32||US-25 is rerouted from downtown Monroe northerly to follow Dixie Hwy to its end at Telegraph Rd north of Monroe. Previously, US-25 turned westerly in downtown Monroe to US-24/Telegraph Rd and ran concurrently with US-24 from that point.|
|1933||US-25 is extended northerly from Port Huron along the route of M-29 to end in Port Austin and the M-25 designation is applied to the portion of the former M-29 from Port Austin to Bay City. The M-25 designation was applied to this route for two reasons: First, to avoid having a discontinuous M-29 and, second, to continue the convention begun with US-24/M-24, US-112/M-112 and US-131/M-131.|
|1936–37||A second, parallel routing of US-25 is created on the south side of Port Huron with the completion of the Electric Ave routing, now carrying southbound US-25 traffic. Northbound traffic remains on Military St.|
|1940||A new US-25A ("alternate") designation is created on the north side of Port Huron, running primarily via present-day M-25 from Lakeshore Dr southerly to M-51/Pine Grove Ave, then southeasterly along with M-51 back to US-25 in Port Huron. It is presumed this new alternate route is created to allow US-25 traffic access to the newly-completed Bluewater Bridge, which passes over the route of US-25, which runs too close to the shore at that point.|
|1941–42||A northerly extension of Toledo's Summit St into southeastern Monroe Co is completed to US-25 on the south side of Erie. This new highway is designated US-25A, the second such alternate route for US-25 in Michigan.|
|c.1945||By 1945, the new US-25A routing in southeastern Monroe Co has been redesignated as US-24A.|
|1959||The last few miles of gravel-surfaced US-25 are paved, north of Port Hope.|
|1963||A 30-mile section of I-94 freeway is completed from M-102/Shook Rd (present-day Exit 236) south of Mount Clemens to US-25/Gratiot Ave (present-day Exit 266) near Marysville. US-25 is relocated onto I-94 from M-29/23 Mile Rd to the end of the freeway at Marysville. The former route of US-25 along Gratiot Ave from 23 Mile Rd to Muttonville is redesignated as M-19, with the remainder in St Clair Co being turned back to local control. Also, US-25/Gratiot Ave is signed as "TO I-94" from Detroit to Mount Clemens in the gap between completed freeway segments.|
|1964||Eight additional miles of I-94/US-25 freeway are completed from the current end of the freeway at US-25/Gratiot Ave near Marysville to M-146 northwest of downtown Port Huron. From there, I-94/US-25 replaces M-146 as the designation along the freeway leading across the Black River to the foot of the Blue Water Bridge. The former route of US-25 through Marysville and Port Huron is redesignated as BUS US-25. In addition, the route of US-25A from the new I-94/US-25 freeway northerly toward Lakeport is redesignated as part of US-25, while the portion of what had been US-25 from Pine Grove Ave northerly to the former US-25A is turned back to local control.|
|c.1968||Another segment of US-25 is transferred onto its parallel Interstate. This time, the portion of US-25 along Toledo Hwy/Toledo Ave/Dix Hwy and Oakwood Blvd in the Southgate/Lincoln Park/Melvindale and southwest Detroit area is relocated onto nearby I-75 between Exit 34 (Toledo Hwy) and Exit 47 (Clark St).|
|1973||After only 47 years of existence, MDOT working in conjunction with
ODOT in Ohio asks AASHTO and
receives permission to completely decommission US-25 in both states.
The highway has been largely replaced by I-75 throughout
Ohio and into Michigan as far as downtown Detroit. From there northeasterly
to Port Huron, US-25 has been functionally replaced by I-94,
leaving only the stretch from Port Huron to Port Austin unduplicated.
Interestingly enough, however, all portions of US-25 in existence at
time of decommissioning remain part of the state trunkline system!
The replacement designations are as follows: