US Bridges

I-75 NB over Pontiac RD

Fair

Oakland County, Michigan · 2.0 MI N of M-59 · Structure no. 000000000008004

Built
1963
62 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
130 ft
3 main spans
Daily traffic
71,900
2009 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over Pontiac RD is a prestressed concrete stringer/multi-beam or girder carrying I-75 NB over Pontiac RD in Oakland County, Michigan. It was built in 1963, so it is 62 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 6 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 71,900 vehicles a day, roughly 4% of them trucks, projected to reach 80,300 by 2029. The structure is 130 ft (39.6 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 NB
CrossesPontiac RD
Location2.0 MI N of M-59
RouteInterstate 75
CountyOakland County
StateMichigan
Coordinates42.67094, -83.24102
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.8 US tons
Inventory rating42.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length130 ft (39.6 m)
Longest span63 ft (19.1 m)
Deck width73 ft (22.2 m)
Roadway width70 ft (21.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71,900 (2009)
Projected traffic80,300 by 2029
Trucks4%
Lanes on structure5
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 Pontiac RD built?

It was built in 1963, making it 62 years old in 2025.

What condition is I-75 NB over Pontiac RD 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 September 2024.

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

About 71,900 vehicles per day (2009 count), of which roughly 4% are trucks.

How long is I-75 NB over Pontiac RD?

The structure is 130 ft (39.6 m) long with a longest span of 63 ft (19.1 m) and a deck 73 ft wide.

Who owns I-75 NB over Pontiac RD?

It is owned by the State Highway Agency.