US Bridges

US-12 over I-75 NB

Fair

Wayne County, Michigan · In Detroit · Structure no. 000000000011748

Built
1970
55 years old, rebuilt 1998
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
229 ft
3 main spans
Daily traffic
13,147
2007 count
Owner
State
State Highway Agency

About this bridge

US-12 over I-75 NB is a steel stringer/multi-beam or girder carrying US-12 over I-75 NB in Wayne County, Michigan. It was built in 1970 and reconstructed in 1998, so it is 55 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 13,147 vehicles a day, roughly 10% of them trucks, projected to reach 12,175 by 2018. The structure is 229 ft (69.8 m) long and 113 ft wide.

Location

Open in Google Maps
CarriesUS-12
CrossesI-75 NB
LocationIn Detroit
RouteU.S. Route 12
CountyWayne County
StateMichigan
Coordinates42.33148, -83.08456
Functional classUrban Other Principal Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length229 ft (69.8 m)
Longest span107 ft (32.6 m)
Deck width113 ft (34.5 m)
Roadway width94 ft (28.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,147 (2007)
Projected traffic12,175 by 2018
Trucks10%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 US-12 over I-75 NB built?

It was built in 1970, making it 55 years old in 2025. It was reconstructed in 1998.

What condition is US-12 over I-75 NB 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 May 2024.

How much traffic does US-12 over I-75 NB carry?

About 13,147 vehicles per day (2007 count), of which roughly 10% are trucks.

How long is US-12 over I-75 NB?

The structure is 229 ft (69.8 m) long with a longest span of 107 ft (32.6 m) and a deck 113 ft wide.

Who owns US-12 over I-75 NB?

It is owned by the State Highway Agency.