US Bridges

I-75 NB over 12 Mile RD

Good

Oakland County, Michigan · In Madison Hts · Structure no. 000000000008058

Built
2022
3 years old
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
170 ft
2 main spans
Daily traffic
85,365
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over 12 Mile RD is a prestressed concrete stringer/multi-beam or girder carrying I-75 NB over 12 Mile RD in Oakland County, Michigan. It was built in 2022, so it is 3 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 85,365 vehicles a day, roughly 5% of them trucks, projected to reach 98,170 by 2027. The structure is 170 ft (51.8 m) long and 77 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 NB
Crosses12 Mile RD
LocationIn Madison Hts
RouteInterstate 75
CountyOakland County
StateMichigan
Coordinates42.50452, -83.11466
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.1 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length170 ft (51.8 m)
Longest span85 ft (25.9 m)
Deck width77 ft (23.4 m)
Roadway width73 ft (22.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic85,365 (2007)
Projected traffic98,170 by 2027
Trucks5%
Lanes on structure4
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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-75 NB over 12 Mile RD built?

It was built in 2022, making it 3 years old in 2025.

What condition is I-75 NB over 12 Mile RD in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.

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

About 85,365 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is I-75 NB over 12 Mile RD?

The structure is 170 ft (51.8 m) long with a longest span of 85 ft (25.9 m) and a deck 77 ft wide.

Who owns I-75 NB over 12 Mile RD?

It is owned by the State Highway Agency.