US Bridges

I-75 SB over 12 Mile RD

Good

Oakland County, Michigan · In Madison Hts · Structure no. 000000000008059

Built
2023
2 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
170 ft
2 main spans
Daily traffic
76,400
2013 count
Owner
State
State Highway Agency

About this bridge

I-75 SB over 12 Mile RD is a prestressed concrete stringer/multi-beam or girder carrying I-75 SB over 12 Mile RD in Oakland County, Michigan. It was built in 2023, so it is 2 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 9 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 76,400 vehicles a day, roughly 4% of them trucks, projected to reach 87,860 by 2033. The structure is 170 ft (51.8 m) long and 74 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 SB
Crosses12 Mile RD
LocationIn Madison Hts
RouteInterstate 75
CountyOakland County
StateMichigan
Coordinates42.5045, -83.115
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
Deck9 ExcellentNo problems noted.
Superstructure9 ExcellentNo problems noted.
Substructure9 ExcellentNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation9: Superior to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.3 US tons
Inventory rating50 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadGreater than HL 93
Structure length170 ft (51.8 m)
Longest span85 ft (25.9 m)
Deck width74 ft (22.5 m)
Roadway width71 ft (21.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic76,400 (2013)
Projected traffic87,860 by 2033
Trucks4%
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 SB over 12 Mile RD built?

It was built in 2023, making it 2 years old in 2025.

What condition is I-75 SB 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 July 2023.

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

About 76,400 vehicles per day (2013 count), of which roughly 4% are trucks.

How long is I-75 SB 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 74 ft wide.

Who owns I-75 SB over 12 Mile RD?

It is owned by the State Highway Agency.