US Bridges

I-75 over NS & Cn Railroad

Good

Monroe County, Michigan · 0.7 MI N of M-50 · Structure no. 000000000007195

Built
1956
69 years old, rebuilt 2016
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
346 ft
5 main spans
Daily traffic
65,200
2013 count
Owner
State
State Highway Agency

About this bridge

I-75 over NS & Cn Railroad is a steel continuous stringer/multi-beam or girder carrying I-75 over NS & Cn Railroad in Monroe County, Michigan. It was built in 1956 and reconstructed in 2016, so it is 69 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 65,200 vehicles a day, roughly 21% of them trucks, projected to reach 71,200 by 2035. The structure is 346 ft (105.6 m) long and 125 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesI-75
CrossesNS & Cn Railroad
Location0.7 MI N of M-50
RouteInterstate 75
Coordinates41.93653, -83.35973
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.8 US tons
Inventory rating60 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadGreater than HL 93
Structure length346 ft (105.6 m)
Longest span84 ft (25.5 m)
Deck width125 ft (38.2 m)
Roadway width119 ft (36.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65,200 (2013)
Projected traffic71,200 by 2035
Trucks21%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 over NS & Cn Railroad built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 2016.

What condition is I-75 over NS & Cn Railroad in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does I-75 over NS & Cn Railroad carry?

About 65,200 vehicles per day (2013 count), of which roughly 21% are trucks.

How long is I-75 over NS & Cn Railroad?

The structure is 346 ft (105.6 m) long with a longest span of 84 ft (25.5 m) and a deck 125 ft wide.

Who owns I-75 over NS & Cn Railroad?

It is owned by the State Highway Agency.