US Bridges

I-275 SB over I-75

Fair

Monroe County, Michigan · 5 MI N of Monroe · Structure no. 000000000007211

Built
1973
52 years old, rebuilt 2011
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
272 ft
4 main spans
Daily traffic
1,210
2010 count
Owner
State
State Highway Agency

About this bridge

I-275 SB over I-75 is a steel stringer/multi-beam or girder carrying I-275 SB over I-75 in Monroe County, Michigan. It was built in 1973 and reconstructed in 2011, 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 6 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 1,210 vehicles a day, roughly 22% of them trucks, projected to reach 1,525 by 2040. The structure is 272 ft (82.8 m) long and 38 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-275 SB
CrossesI-75
Location5 MI N of Monroe
RouteInterstate 275
CountyMonroe County
StateMichigan
Coordinates41.98643, -83.33174
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2024
Inspection intervalevery 9 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating100.3 US tons
Inventory rating60 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length272 ft (82.8 m)
Longest span110 ft (33.4 m)
Deck width38 ft (11.5 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,210 (2010)
Projected traffic1,525 by 2040
Trucks22%
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-275 SB over I-75 built?

It was built in 1973, making it 52 years old in 2025. It was reconstructed in 2011.

What condition is I-275 SB 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-275 SB over I-75 carry?

About 1,210 vehicles per day (2010 count), of which roughly 22% are trucks.

How long is I-275 SB over I-75?

The structure is 272 ft (82.8 m) long with a longest span of 110 ft (33.4 m) and a deck 38 ft wide.

Who owns I-275 SB over I-75?

It is owned by the State Highway Agency.