US Bridges

I-94 over Huron River

Fair

Washtenaw County, Michigan · In Ypsilanti · Structure no. 000000000010843

Built
1971
54 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
110 ft
3 main spans
Daily traffic
102,776
2007 count
Owner
State
State Highway Agency

About this bridge

I-94 over Huron River is a prestressed concrete box beam or girders - multiple carrying I-94 over Huron River in Washtenaw County, Michigan. It was built in 1971, so it is 54 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 5 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 102,776 vehicles a day, roughly 10% of them trucks, projected to reach 117,095 by 2018. The structure is 110 ft (33.5 m) long and 111 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI-94
CrossesHuron River
LocationIn Ypsilanti
RouteInterstate 94
CountyWashtenaw County
StateMichigan
Coordinates42.23093, -83.60695
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating75.7 US tons
Inventory rating45.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length110 ft (33.5 m)
Longest span42 ft (12.8 m)
Deck width111 ft (33.9 m)
Roadway width109 ft (33.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic102,776 (2007)
Projected traffic117,095 by 2018
Trucks10%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-94 over Huron River built?

It was built in 1971, making it 54 years old in 2025.

What condition is I-94 over Huron River 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 over Huron River carry?

About 102,776 vehicles per day (2007 count), of which roughly 10% are trucks.

How long is I-94 over Huron River?

The structure is 110 ft (33.5 m) long with a longest span of 42 ft (12.8 m) and a deck 111 ft wide.

Who owns I-94 over Huron River?

It is owned by the State Highway Agency.