US Bridges

I-75 NB over Clarkston RD

Poor

Oakland County, Michigan · 1.1 MI SE of M-15 · Structure no. 000000000008021

Built
1962
63 years old, rebuilt 1988
Condition
Poor
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
109 ft
3 main spans
Daily traffic
35,763
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over Clarkston RD is a steel stringer/multi-beam or girder carrying I-75 NB over Clarkston RD in Oakland County, Michigan. It was built in 1962 and reconstructed in 1988, so it is 63 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 35,763 vehicles a day, roughly 5% of them trucks, projected to reach 48,200 by 2029. The structure is 109 ft (33.1 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 NB
CrossesClarkston RD
Location1.1 MI SE of M-15
RouteInterstate 75
CountyOakland County
StateMichigan
Coordinates42.74568, -83.3998
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.8 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length109 ft (33.1 m)
Longest span40 ft (12.3 m)
Deck width62 ft (18.9 m)
Roadway width59 ft (18 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,763 (2007)
Projected traffic48,200 by 2029
Trucks5%
Lanes on structure3
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 Clarkston RD built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1988.

What condition is I-75 NB over Clarkston RD in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2023.

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

About 35,763 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is I-75 NB over Clarkston RD?

The structure is 109 ft (33.1 m) long with a longest span of 40 ft (12.3 m) and a deck 62 ft wide.

Who owns I-75 NB over Clarkston RD?

It is owned by the State Highway Agency.