US Bridges

I-75 NB over Gtw RR

Good

Monroe County, Michigan · 3.5 MI NE Ohio State Line · Structure no. 000000000007170

Built
2019
6 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
134 ft
1 main span
Daily traffic
27,575
2015 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over Gtw RR is a steel stringer/multi-beam or girder carrying I-75 NB over Gtw RR in Monroe County, Michigan. It was built in 2019, so it is 6 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 27,575 vehicles a day, roughly 29% of them trucks, projected to reach 30,773 by 2036. The structure is 134 ft (40.8 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 NB
CrossesGtw RR
Location3.5 MI NE Ohio State Line
RouteInterstate 75
CountyMonroe County
StateMichigan
Coordinates41.77993, -83.47329
Functional classRural 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating56.4 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length134 ft (40.8 m)
Longest span130 ft (39.6 m)
Deck width64 ft (19.4 m)
Roadway width60 ft (18.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,575 (2015)
Projected traffic30,773 by 2036
Trucks29%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 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 proposedDeck replacement with only incidental widening
Estimated improvement cost$67,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 NB over Gtw RR built?

It was built in 2019, making it 6 years old in 2025.

What condition is I-75 NB over Gtw RR 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 June 2023.

How much traffic does I-75 NB over Gtw RR carry?

About 27,575 vehicles per day (2015 count), of which roughly 29% are trucks.

How long is I-75 NB over Gtw RR?

The structure is 134 ft (40.8 m) long with a longest span of 130 ft (39.6 m) and a deck 64 ft wide.

Who owns I-75 NB over Gtw RR?

It is owned by the State Highway Agency.