US Bridges

I-75 over Fort ST

Fair

Wayne County, Michigan · In Detroit · Structure no. 000000000011734

Built
1967
58 years old, rebuilt 2018
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
822 ft
10 main spans
Daily traffic
103,925
2014 count
Owner
State
State Highway Agency

About this bridge

I-75 over Fort ST is a steel stringer/multi-beam or girder carrying I-75 over Fort ST in Wayne County, Michigan. It was built in 1967 and reconstructed in 2018, so it is 58 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 103,925 vehicles a day, roughly 12% of them trucks, projected to reach 116,550 by 2037. The structure is 822 ft (250.5 m) long and 132 ft wide.

Location

Open in Google Maps
CarriesI-75
CrossesFort ST
LocationIn Detroit
RouteInterstate 75
CountyWayne County
StateMichigan
Coordinates42.29858, -83.12339
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.1 US tons
Inventory rating49.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans10
Design loadHS 20 + Mod
Structure length822 ft (250.5 m)
Longest span123 ft (37.5 m)
Deck width132 ft (40.2 m)
Roadway width125 ft (38.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic103,925 (2014)
Projected traffic116,550 by 2037
Trucks12%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 over Fort ST built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2018.

What condition is I-75 over Fort ST in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.

How much traffic does I-75 over Fort ST carry?

About 103,925 vehicles per day (2014 count), of which roughly 12% are trucks.

How long is I-75 over Fort ST?

The structure is 822 ft (250.5 m) long with a longest span of 123 ft (37.5 m) and a deck 132 ft wide.

Who owns I-75 over Fort ST?

It is owned by the State Highway Agency.