US Bridges

I-94 EB over Griswold Road

Fair

St. Clair County, Michigan · Port Huron Twp Sec 8-17 · Structure no. 000000000013160

Built
2003
22 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
82 ft
1 main span
Daily traffic
14,887
2007 count
Owner
State
State Highway Agency

About this bridge

I-94 EB over Griswold Road is a prestressed concrete stringer/multi-beam or girder carrying I-94 EB over Griswold Road in St. Clair County, Michigan. It was built in 2003, so it is 22 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 14,887 vehicles a day, roughly 14% of them trucks, projected to reach 20,500 by 2028. The structure is 82 ft (24.9 m) long and 48 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesI-94 EB
CrossesGriswold Road
LocationPort Huron Twp Sec 8-17
RouteInterstate 94
CountySt. Clair County
StateMichigan
Coordinates42.96588, -82.48961
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJuly 2024
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 alignment6: Equal to present minimum criteria
Operating rating80 US tons
Inventory rating46.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length82 ft (24.9 m)
Longest span78 ft (23.7 m)
Deck width48 ft (14.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,887 (2007)
Projected traffic20,500 by 2028
Trucks14%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 km)
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-94 EB over Griswold Road built?

It was built in 2003, making it 22 years old in 2025.

What condition is I-94 EB over Griswold Road 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 July 2024.

How much traffic does I-94 EB over Griswold Road carry?

About 14,887 vehicles per day (2007 count), of which roughly 14% are trucks.

How long is I-94 EB over Griswold Road?

The structure is 82 ft (24.9 m) long with a longest span of 78 ft (23.7 m) and a deck 48 ft wide.

Who owns I-94 EB over Griswold Road?

It is owned by the State Highway Agency.