US Bridges

I-75 SB over Pontiac Road

Fair

Oakland County, Michigan · 2.0 MI N of M-59 · Structure no. 000000000013196

Built
1963
62 years old, rebuilt 1989
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
130 ft
3 main spans
Daily traffic
56,400
2019 count
Owner
State
State Highway Agency

About this bridge

I-75 SB over Pontiac Road is a prestressed concrete stringer/multi-beam or girder carrying I-75 SB over Pontiac Road in Oakland County, Michigan. It was built in 1963 and reconstructed in 1989, 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 56,400 vehicles a day, roughly 6% of them trucks, projected to reach 59,900 by 2039. The structure is 130 ft (39.6 m) long and 102 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-75 SB
CrossesPontiac Road
Location2.0 MI N of M-59
RouteInterstate 75
CountyOakland County
StateMichigan
Coordinates42.67097, -83.24134
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating37.5 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 width102 ft (31.1 m)
Roadway width96 ft (29.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic56,400 (2019)
Projected traffic59,900 by 2039
Trucks6%
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 SB over Pontiac Road built?

It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1989.

What condition is I-75 SB over Pontiac Road 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 SB over Pontiac Road carry?

About 56,400 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is I-75 SB over Pontiac Road?

The structure is 130 ft (39.6 m) long with a longest span of 63 ft (19.1 m) and a deck 102 ft wide.

Who owns I-75 SB over Pontiac Road?

It is owned by the State Highway Agency.