US Bridges

I-94 WB over ST Clair River Cn RR

GoodPosted for load

St. Clair County, Michigan · At Port Huron · Structure no. 000000000009988

Built
1938
87 years old, rebuilt 1999
Condition
Good
inspected October 2024
Type
Truss - Thru
Steel
Length
6,178 ft
3 main spans
Daily traffic
7,234
2007 count
Owner
State
State Highway Agency

About this bridge

I-94 WB over ST Clair River Cn RR is a steel truss - thru carrying I-94 WB over ST Clair River Cn RR in St. Clair County, Michigan. It was built in 1938 and reconstructed in 1999, so it is 87 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. Its operating status is: posted for load restriction.

It carries about 7,234 vehicles a day, roughly 28% of them trucks, projected to reach 9,068 by 2018. The structure is 6,178 ft (1,883.2 m) long and 37 ft wide.

Location

Open in Google Maps
CarriesI-94 WB
CrossesST Clair River Cn RR
LocationAt Port Huron
RouteInterstate 94
CountySt. Clair County
StateMichigan
Coordinates42.99929, -82.42487
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating41.1 US tons
Inventory rating24.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+64 approach)
Design loadUnknown
Structure length6,178 ft (1,883.2 m)
Longest span871 ft (265.5 m)
Deck width37 ft (11.4 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deck13 ft (4.1 m)

Traffic and service

Average daily traffic7,234 (2007)
Projected traffic9,068 by 2018
Trucks28%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
Detour if closed—
TollToll bridge
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was I-94 WB over ST Clair River Cn RR built?

It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1999.

What condition is I-94 WB over ST Clair River Cn 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 October 2024.

How much traffic does I-94 WB over ST Clair River Cn RR carry?

About 7,234 vehicles per day (2007 count), of which roughly 28% are trucks.

How long is I-94 WB over ST Clair River Cn RR?

The structure is 6,178 ft (1,883.2 m) long with a longest span of 871 ft (265.5 m) and a deck 37 ft wide.

Who owns I-94 WB over ST Clair River Cn RR?

It is owned by the State Highway Agency.