M-146 | ||||
|---|---|---|---|---|
M-146 highlighted in red on a modern map
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| Route information | ||||
| Maintained by MDOT | ||||
| Length | 0.910 mi[5] (1,465 m) | |||
| Existed | 1933[1][2]–1966[3][4] | |||
| Major junctions | ||||
| South end |  M-21inPort Huron | |||
| North end |   I-94 / US 25inPort Huron Township | |||
| Location | ||||
| Country | United States | |||
| State | Michigan | |||
| Counties | St. Clair | |||
| Highway system | ||||
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M-146 was a state trunkline highway in the US state of Michigan that initially served as a bypass for traffic going around Port Huron and as a short cut for traffic between U.S. Highway 25 (US 25) and M-21. Later it connected to the Blue Water Bridge before it was truncated to its final form. Segments of M-146 still exist today as state highways as part of Interstate 94 (I-94) and I-69 and the Lapeer Connector.
As the highway last existed, its southern end was at an intersection with M-21 (Lapeer Road) in a residential area of Port Huron west of the Black River. Following what is today named the Lapeer Connector, M-146 ran northward for about 0.9 miles (1.4 km) to an interchange with I-94/US 25 where it terminated.[3][6]
When the route debuted in 1933 it served as a connector between US 25 in southwest Port Huron and M-21 along the west side of town.[1][2] In 1954 a new approach was built from M-21 to the foot of the Blue Water Bridge, and M-146 was extended northward and easterly, designated along this new route.[7][8] By 1958, this newer segment was converted to freeway specifications,[9][10] and in 1964, with the completion of the I-94/US 25 freeway, M-146 was removed from that portion of the route.[11][12] By the next year, the M-146 designation only remained along the stretch of freeway which now serves as the exit 274 interchange on I-94, and was removed from 24th Street through town.[3][12] The alignment of the freeway stretch of M-146 was shifted slightly as well, allowing for a smoother transition between it and westbound I-94. In addition, the diamond interchange with Water Street along the Blue Water Bridge approach was reconstructed and appropriated into the alignment of I-94.[13] In 1966, with the completion of a new freeway alignment for M-21 between Wadhams and downtown Port Huron, the M-146 designation was removed from the state trunkline system,[3][4] and has not been used since. The connector between Lapeer Street and present-day I-94 is now known as the Lapeer Connector[14] and Connector 69.[15]
The entire highway was in St. Clair County.
| Location | mi[5] | km | Destinations | Notes | |
|---|---|---|---|---|---|
| Port Huron | 0.000 | 0.000 | M-21 (Lapeer Road) | Lapeer Road is no longer a state highway | |
| Port Huron Township | 0.910 | 1.465 | I-94 / US 25 – Detroit | Now exit 274 on I-94/I-69 | |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi | |||||
