US Bridges

I-75 NB over Square Lake RD

Good

Oakland County, Michigan · In Troy · Structure no. 000000000008079

Built
2017
8 years old
Condition
Good
inspected December 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
148 ft
1 main span
Daily traffic
52,934
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over Square Lake RD is a prestressed concrete stringer/multi-beam or girder carrying I-75 NB over Square Lake RD 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 52,934 vehicles a day, roughly 8% of them trucks, projected to reach 56,219 by 2018. The structure is 148 ft (45.1 m) long and 74 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 NB
CrossesSquare Lake RD
LocationIn Troy
RouteInterstate 75
CountyOakland County
StateMichigan
Coordinates42.60608, -83.20543
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.8 US tons
Inventory rating61.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length148 ft (45.1 m)
Longest span148 ft (45.1 m)
Deck width74 ft (22.5 m)
Roadway width71 ft (21.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52,934 (2007)
Projected traffic56,219 by 2018
Trucks8%
Lanes on structure4
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 Square Lake RD built?

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

What condition is I-75 NB over Square Lake RD 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 December 2023.

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

About 52,934 vehicles per day (2007 count), of which roughly 8% are trucks.

How long is I-75 NB over Square Lake RD?

The structure is 148 ft (45.1 m) long with a longest span of 148 ft (45.1 m) and a deck 74 ft wide.

Who owns I-75 NB over Square Lake RD?

It is owned by the State Highway Agency.