US Bridges

I-75 NB over Big Beaver RD

Good

Oakland County, Michigan · In Troy · Structure no. 000000000008068

Built
2019
6 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
231 ft
2 main spans
Daily traffic
56,557
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over Big Beaver RD is a prestressed concrete stringer/multi-beam or girder carrying I-75 NB over Big Beaver RD in Oakland County, Michigan. It was built in 2019, so it is 6 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 56,557 vehicles a day, roughly 8% of them trucks, projected to reach 58,600 by 2029. The structure is 231 ft (70.5 m) long and 68 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 NB
CrossesBig Beaver RD
LocationIn Troy
RouteInterstate 75
CountyOakland County
StateMichigan
Coordinates42.5621, -83.15803
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 inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.3 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadGreater than HL 93
Structure length231 ft (70.5 m)
Longest span117 ft (35.7 m)
Deck width68 ft (20.6 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,557 (2007)
Projected traffic58,600 by 2029
Trucks8%
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 Big Beaver RD built?

It was built in 2019, making it 6 years old in 2025.

What condition is I-75 NB over Big Beaver 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 NB over Big Beaver RD carry?

About 56,557 vehicles per day (2007 count), of which roughly 8% are trucks.

How long is I-75 NB over Big Beaver RD?

The structure is 231 ft (70.5 m) long with a longest span of 117 ft (35.7 m) and a deck 68 ft wide.

Who owns I-75 NB over Big Beaver RD?

It is owned by the State Highway Agency.