US Bridges

I-75NB to I-275NB over I-75

Fair

Monroe County, Michigan · 5 MI N of Monroe · Structure no. 000000000007212

Built
1973
52 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
356 ft
4 main spans
Daily traffic
15,020
2007 count
Owner
State
State Highway Agency

About this bridge

I-75NB to I-275NB over I-75 is a steel stringer/multi-beam or girder carrying I-75NB to I-275NB over I-75 in Monroe County, Michigan. It was built in 1973, so it is 52 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 15,020 vehicles a day, roughly 23% of them trucks, projected to reach 15,418 by 2018. The structure is 356 ft (108.4 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75NB to I-275NB
CrossesI-75
Location5 MI N of Monroe
RouteInterstate 275
CountyMonroe County
StateMichigan
Coordinates41.99222, -83.32687
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 9 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 geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating92.5 US tons
Inventory rating55.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length356 ft (108.4 m)
Longest span130 ft (39.6 m)
Deck width45 ft (13.6 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,020 (2007)
Projected traffic15,418 by 2018
Trucks23%
Lanes on structure2
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-75NB to I-275NB over I-75 built?

It was built in 1973, making it 52 years old in 2025.

What condition is I-75NB to I-275NB over I-75 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 October 2024.

How much traffic does I-75NB to I-275NB over I-75 carry?

About 15,020 vehicles per day (2007 count), of which roughly 23% are trucks.

How long is I-75NB to I-275NB over I-75?

The structure is 356 ft (108.4 m) long with a longest span of 130 ft (39.6 m) and a deck 45 ft wide.

Who owns I-75NB to I-275NB over I-75?

It is owned by the State Highway Agency.