US Bridges

I-75 NB over M-59

Fair

Oakland County, Michigan · @ (M-59) E of Pontiac · Structure no. 000000000007999

Built
1963
62 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
231 ft
4 main spans
Daily traffic
63,925
2019 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over M-59 is a steel stringer/multi-beam or girder carrying I-75 NB over M-59 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 5 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 63,925 vehicles a day, roughly 6% of them trucks, projected to reach 67,875 by 2039. The structure is 231 ft (70.3 m) long and 75 ft wide.

Location

Open in Google Maps
CarriesI-75 NB
CrossesM-59
Location@ (M-59) E of Pontiac
RouteInterstate 75
CountyOakland County
StateMichigan
Coordinates42.64174, -83.23824
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
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 rating68.6 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length231 ft (70.3 m)
Longest span81 ft (24.8 m)
Deck width75 ft (23 m)
Roadway width72 ft (22 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic63,925 (2019)
Projected traffic67,875 by 2039
Trucks6%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 M-59 built?

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

What condition is I-75 NB over M-59 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 July 2023.

How much traffic does I-75 NB over M-59 carry?

About 63,925 vehicles per day (2019 count), of which roughly 6% are trucks.

How long is I-75 NB over M-59?

The structure is 231 ft (70.3 m) long with a longest span of 81 ft (24.8 m) and a deck 75 ft wide.

Who owns I-75 NB over M-59?

It is owned by the State Highway Agency.