US Bridges

I-94 EB over ST Clair River Cn RR

Fair

St. Clair County, Michigan · At Port Huron · Structure no. 000000000009987

Built
1997
28 years old
Condition
Fair
inspected October 2024
Type
Arch - Thru
Steel Continuous
Length
6,111 ft
3 main spans
Daily traffic
6,542
2016 count
Owner
State
State Highway Agency

About this bridge

I-94 EB over ST Clair River Cn RR is a steel continuous arch - thru carrying I-94 EB over ST Clair River Cn RR in St. Clair County, Michigan. It was built in 1997, so it is 28 years old, younger 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 6,542 vehicles a day, roughly 36% of them trucks, projected to reach 7,523 by 2036. The structure is 6,111 ft (1,862.5 m) long and 52 ft wide.

Location

Open in Google Maps
CarriesI-94 EB
CrossesST Clair River Cn RR
LocationAt Port Huron
RouteInterstate 94
CountySt. Clair County
StateMichigan
Coordinates42.99896, -82.42511
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations on dry land well above flood water elevations
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating40.3 US tons
Inventory rating32.8 US tons

Structure

Structure typeArch - Thru
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+36 approach)
Design loadUnknown
Structure length6,111 ft (1,862.5 m)
Longest span922 ft (281 m)
Deck width52 ft (15.7 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deck21 ft (6.3 m)

Traffic and service

Average daily traffic6,542 (2016)
Projected traffic7,523 by 2036
Trucks36%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway and pedestrian
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 statusNot eligible for 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 EB over ST Clair River Cn RR built?

It was built in 1997, making it 28 years old in 2025.

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

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

About 6,542 vehicles per day (2016 count), of which roughly 36% are trucks.

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

The structure is 6,111 ft (1,862.5 m) long with a longest span of 922 ft (281 m) and a deck 52 ft wide.

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

It is owned by the State Highway Agency.