US Bridges

I-94 over I-94 Bl

Fair

Washtenaw County, Michigan · In Ann Arbor · Structure no. 000000000010831

Built
1956
69 years old
Condition
Fair
inspected June 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
191 ft
3 main spans
Daily traffic
55,510
2007 count
Owner
State
State Highway Agency

About this bridge

I-94 over I-94 Bl is a steel stringer/multi-beam or girder carrying I-94 over I-94 Bl in Washtenaw County, Michigan. It was built in 1956, so it is 69 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 55,510 vehicles a day, roughly 19% of them trucks, projected to reach 60,021 by 2018. The structure is 191 ft (58.2 m) long and 95 ft wide.

Location

Open in Google Maps
CarriesI-94
CrossesI-94 Bl
LocationIn Ann Arbor
RouteInterstate 94
CountyWashtenaw County
StateMichigan
Coordinates42.28156, -83.78411
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71.4 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length191 ft (58.2 m)
Longest span79 ft (24 m)
Deck width95 ft (29 m)
Roadway width94 ft (28.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55,510 (2007)
Projected traffic60,021 by 2018
Trucks19%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedDeck replacement with only incidental widening
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-94 over I-94 Bl built?

It was built in 1956, making it 69 years old in 2025.

What condition is I-94 over I-94 Bl 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 June 2024.

How much traffic does I-94 over I-94 Bl carry?

About 55,510 vehicles per day (2007 count), of which roughly 19% are trucks.

How long is I-94 over I-94 Bl?

The structure is 191 ft (58.2 m) long with a longest span of 79 ft (24 m) and a deck 95 ft wide.

Who owns I-94 over I-94 Bl?

It is owned by the State Highway Agency.