US Bridges

ST Clair HWY over I-94

Fair

St. Clair County, Michigan · 5.9 MI NE of Macomb Col · Structure no. 000000000010001

Built
1964
61 years old, rebuilt 2003
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
316 ft
4 main spans
Daily traffic
2,130
1993 count
Owner
State
State Highway Agency

About this bridge

ST Clair HWY over I-94 is a prestressed concrete stringer/multi-beam or girder carrying ST Clair HWY over I-94 in St. Clair County, Michigan. It was built in 1964 and reconstructed in 2003, so it is 61 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 2,130 vehicles a day, roughly 4% of them trucks, projected to reach 3,700 by 2020. The structure is 316 ft (96.3 m) long and 35 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesST Clair HWY
CrossesI-94
Location5.9 MI NE of Macomb Col
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates42.79769, -82.65036
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating37.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length316 ft (96.3 m)
Longest span106 ft (32.4 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,130 (1993)
Projected traffic3,700 by 2020
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

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 ST Clair HWY over I-94 built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 2003.

What condition is ST Clair HWY over I-94 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 August 2024.

How much traffic does ST Clair HWY over I-94 carry?

About 2,130 vehicles per day (1993 count), of which roughly 4% are trucks.

How long is ST Clair HWY over I-94?

The structure is 316 ft (96.3 m) long with a longest span of 106 ft (32.4 m) and a deck 35 ft wide.

Who owns ST Clair HWY over I-94?

It is owned by the State Highway Agency.