US Bridges

I-75 Bl Rmp En Top over I-75 SB & I-75BL

Good

Oakland County, Michigan · 9.5 MI E of Pontiac · Structure no. 000000000008085

Built
2017
8 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
469 ft
4 main spans
Daily traffic
24,209
1999 count
Owner
State
State Highway Agency

About this bridge

I-75 Bl Rmp En Top over I-75 SB & I-75BL is a prestressed concrete stringer/multi-beam or girder carrying I-75 Bl Rmp En Top over I-75 SB & I-75BL in Oakland County, Michigan. It was built in 2017, so it is 8 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 24,209 vehicles a day, roughly 2% of them trucks, projected to reach 31,472 by 2014. The structure is 469 ft (143 m) long and 47 ft wide.

Location

Open in Google Maps
CarriesI-75 Bl Rmp En Top
CrossesI-75 SB & I-75BL
Location9.5 MI E of Pontiac
RouteInterstate 75
CountyOakland County
StateMichigan
Coordinates42.61352, -83.23281
Functional classUrban Principal Arterial - Interstate

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 inspectionOctober 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 rating58.2 US tons
Inventory rating38.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadGreater than HL 93
Structure length469 ft (143 m)
Longest span153 ft (46.5 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic24,209 (1999)
Projected traffic31,472 by 2014
Trucks2%
Lanes on structure2
Traffic directionOne-way traffic
CarriesThird level (interchange)
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 proposedDeck replacement with only incidental widening
Estimated improvement cost$41,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 Bl Rmp En Top over I-75 SB & I-75BL built?

It was built in 2017, making it 8 years old in 2025.

What condition is I-75 Bl Rmp En Top over I-75 SB & I-75BL 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 October 2023.

How much traffic does I-75 Bl Rmp En Top over I-75 SB & I-75BL carry?

About 24,209 vehicles per day (1999 count), of which roughly 2% are trucks.

How long is I-75 Bl Rmp En Top over I-75 SB & I-75BL?

The structure is 469 ft (143 m) long with a longest span of 153 ft (46.5 m) and a deck 47 ft wide.

Who owns I-75 Bl Rmp En Top over I-75 SB & I-75BL?

It is owned by the State Highway Agency.