US Bridges

I-75 Access Ramps over I-75

Good

Oakland County, Michigan · In Troy · Structure no. 000000000008075

Built
2019
6 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
207 ft
2 main spans
Daily traffic
123,600
2008 count
Owner
State
State Highway Agency

About this bridge

I-75 Access Ramps over I-75 is a prestressed concrete stringer/multi-beam or girder carrying I-75 Access Ramps over I-75 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 123,600 vehicles a day, roughly 7% of them trucks, projected to reach 152,300 by 2029. The structure is 207 ft (63.1 m) long and 55 ft wide.

CarriesI-75 Access Ramps
CrossesI-75
LocationIn Troy
RouteInterstate 75
Coordinates42.59953, -83.16254
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating41.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadGreater than HL 93
Structure length207 ft (63.1 m)
Longest span108 ft (33 m)
Deck width55 ft (16.9 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic123,600 (2008)
Projected traffic152,300 by 2029
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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 Access Ramps over I-75 built?

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

What condition is I-75 Access Ramps over I-75 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 September 2023.

How much traffic does I-75 Access Ramps over I-75 carry?

About 123,600 vehicles per day (2008 count), of which roughly 7% are trucks.

How long is I-75 Access Ramps over I-75?

The structure is 207 ft (63.1 m) long with a longest span of 108 ft (33 m) and a deck 55 ft wide.

Who owns I-75 Access Ramps over I-75?

It is owned by the State Highway Agency.