US Bridges

I-94 S to M-146 S over I-94

Good

St. Clair County, Michigan · 0.7 MI W of Port Huron · Structure no. 000000000010017

Built
2011
14 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
230 ft
3 main spans
Daily traffic
5,600
2010 count
Owner
State
State Highway Agency

About this bridge

I-94 S to M-146 S over I-94 is a prestressed concrete stringer/multi-beam or girder carrying I-94 S to M-146 S over I-94 in St. Clair County, Michigan. It was built in 2011, so it is 14 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 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 5,600 vehicles a day, roughly 6% of them trucks, projected to reach 6,600 by 2030. The structure is 230 ft (70.1 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-94 S to M-146 S
CrossesI-94
Location0.7 MI W of Port Huron
RouteInterstate 94
CountySt. Clair County
StateMichigan
Coordinates42.99055, -82.45836
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2023
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 alignment8: Equal to present desirable criteria
Operating rating83.2 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length230 ft (70.1 m)
Longest span79 ft (24.2 m)
Deck width64 ft (19.4 m)
Roadway width56 ft (17.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,600 (2010)
Projected traffic6,600 by 2030
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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-94 S to M-146 S over I-94 built?

It was built in 2011, making it 14 years old in 2025.

What condition is I-94 S to M-146 S over I-94 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 2023.

How much traffic does I-94 S to M-146 S over I-94 carry?

About 5,600 vehicles per day (2010 count), of which roughly 6% are trucks.

How long is I-94 S to M-146 S over I-94?

The structure is 230 ft (70.1 m) long with a longest span of 79 ft (24.2 m) and a deck 64 ft wide.

Who owns I-94 S to M-146 S over I-94?

It is owned by the State Highway Agency.