Interstate 675 Michigan

Interstate 675 Michigan
Buena Vista Township, MI ↔ Zilwaukee, MI•7.93 miles

Overview

Interstate 675 constitutes an urban loop west from I-75 at Buena Vista Township to Downtown Saginaw. North from the city of Saginaw, I-675 separates Saginaw Township North and Carrollton Township to Tittabawassee Road. The freeway returns to Interstate 75 on the north side of Zilwaukee.

Mileage by State

Michigan7.93 mi

Data Sources

2024 MDOT Linear Referencing System

History

Designated in 1969, Interstate 675 was completed by 1971 (Bessert, 2025). The loop was initially considered as a reliever route for I-75 and the Zilwaukee Bridge, a bascule bridge crossing the Saginaw River. The Zilwaukee Bridge was a well known bottleneck along the drive between Detroit and northern Michigan, as the six lane section of I-75 between Flint and Bay City narrowed to four lanes at the span. Further adding to traffic congestion, openings along the old Zilwaukee Bridge often accommodated steel shipments from a General Motors plant in Saginaw (D. Hargraves, personal communication).

1970 map of Saginaw, Michigan
1970 map of Saginaw showing Interstate 675 under construction and mislabeled as Business Loop I-675.
1970 map of Saginaw, Michigan
Interstate 675 under construction on the 1970 Official Michigan Highway Map. Business Loop I-75 through Saginaw was decommissioned in 1971.

Construction got underway in 1979 to replace the bascule bridge along I-75 with a fixed, high-level span (Bessert, 2024). During the same time steel shipments ceased from the General Motors plant [D. Hargraves, personal communication]. A major incident took place during work on the bridge when a 300 foot long section of the new deck tilted due to excessive construction loads. This pushed back completion of the Zilwaukee Bridge four years, which partially opened with two way traffic on December 23, 1987. For a period of time, local drivers displayed bumper stickers that read "I drove over the Zilwaukee Bridge AND LIVED!". Locally referred to as the Z-Bridge, the new eight lane span was completed on September 19, 1988 (D. Hargraves, personal communication) (Bessert, 2024).

North End Interstate 75 U.S. 23 ‐ Zilwaukee, MI

Interstate 675 North at Interstate 75

I-675 North 0.75 miles from I-75/US 23 near Zilwaukee, MI

Interstate 675 angles northeast from Tittabawassee Road through Kochville Township. Michigan Avenue spans the freeway 0.75 miles ahead of I-75/U.S. 23. 07/22/24

I-675 North 0.75 miles from I-75/US 23 near Zilwaukee, MI I-675 North at I-75/US 23 outside Zilwaukee, MI

Interstate 75 South at Interstate 675

I-75/US 23 South at I-675 near Zilwaukee, MI

Two lanes leave I-75/U.S. 23 south for Interstate 675. I-675 enters the city of Saginaw 4.6 miles southwest from Exit 155. 07/22/24

I-75/US 23 South two miles ahead of I-675 to Saginaw, MI I-75/US 23 one mile ahead of I-675 to Saginaw, MI I-75/US 23 South at I-675 near Zilwaukee, MI I-75/US 23 South at I-675 near Zilwaukee, MI

Interstate 75 North at Interstate 675

I-75/US 23 north at I-675 - Zilwaukee, MI

I-75/U.S. 23 cross the Saginaw River ahead of Exit 154 for Adams Street in Zilwaukee and one mile from Interstate 675. 07/22/24

I-75/US 23 north at I-675 - Zilwaukee, MI I-75/US 23 North at I-675 near Zilwaukee, MI

North End – Past Views

Past Views Gallery (Tap to Expand / Collapse Section)

Interstate 675 at Interstate 75 U.S. 23

I-675 north at I-75/US 23 - Kochville Twp, MI

Previous overhead for I-75/U.S. 23 with Highway Gothic font. 11/06/09

I-675 north at I-75/US 23 - Kochville Twp, MI I-675 north at I-75/US 23 - Zilwaukee Twp, MI I-75/US 23 south at I-675 - Frankenlust Twp, MI I-75/US 23 south at I-675 - Kochville Twp, MI I-75/US 23 south at I-675 - Kochville Twp, MI I-75/US 23 north at I-675 - Zilwaukee, MI

South End Interstate 75 U.S. 23 ‐ Buena Vista Township, MI

Interstate 675 South at Interstate 75

I-675 south at I-75/US 23 - Saginaw, MI

Interstate 675 was reconstructed through Saginaw in 2009-10. Advancing east from Veterans Memorial Parkway, the freeway crosses into Buena Vista Township ahead of I-75/U.S. 23. 07/22/24

I-675 south at I-75/US 23 - Saginaw, MI I-675 south at I-75/US 23 - Saginaw, MI

Interstate 75 U.S. 23 North at Interstate 675

I-75/US 23 North at I-675 - Buena Vista, MI

An auxiliary lane opens along I-75/U.S. 23 northbound from the M-46 entrance ramp to Exit 150 for Interstate 675 north into Saginaw. 07/22/24

I-75/US 23 North at I-675 - Buena Vista, MI I-75/US 23 North at I-675 - Buena Vista, MI

Interstate 75 South at Interstate 675

I-75/US 23 south at Buena Vista Twp, MI

Interstate 675 returns to I-75/U.S. 23 one mile south of the dumbbell interchange (Exit 152) with M-81 (Washington Road). 07/22/24

I-75/US 23 south at Buena Vista Twp, MI I-75/US 23 South at I-675 North to Saginaw, MI

South End – Past Views

Past Views Gallery (Tap to Expand / Collapse Section)

Interstate 675 at Interstate 75 U.S. 23

I-75/US 23 south at Buena Vista Twp, MI

An overhead replaced this ground level assembly at Exit 150 during reconstruction of I-75 at I-675 in 2014. 11/06/09

References

Bessert, C. (2025, December 4). Highways 250 through 696. Michigan Highways. Retrieved from https://www.michiganhighways.org/listings/MichHwys250-696.html#I-675
Bessert, C. (2024, March 4). The Zilwaukee Bridge. Michigan Highways. Retrieved from http://www.michiganhighways.org/indepth/zilwaukee.html
Updated August 19, 2026