US Bridges

I-75 &M-125 Conn over I-75

Fair

Monroe County, Michigan · 1.6 MI N of State Line · Structure no. 000000000007186

Built
1975
50 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
476 ft
5 main spans
Daily traffic
2,700
1995 count
Owner
State
State Highway Agency

About this bridge

I-75 &M-125 Conn over I-75 is a steel stringer/multi-beam or girder carrying I-75 &M-125 Conn over I-75 in Monroe County, Michigan. It was built in 1975, so it is 50 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 2,700 vehicles a day, roughly 6% of them trucks, projected to reach 2,793 by 2015. The structure is 476 ft (145.1 m) long and 27 ft wide.

Location

Open in Google Maps
CarriesI-75 &M-125 Conn
CrossesI-75
Location1.6 MI N of State Line
RouteInterstate 75
CountyMonroe County
StateMichigan
Coordinates41.75441, -83.48182
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating44.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans5
Design loadHS 25 or greater
Structure length476 ft (145.1 m)
Longest span132 ft (40.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,700 (1995)
Projected traffic2,793 by 2015
Trucks6%
Lanes on structure1
Traffic directionOne-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 &M-125 Conn over I-75 built?

It was built in 1975, making it 50 years old in 2025.

What condition is I-75 &M-125 Conn 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 June 2023.

How much traffic does I-75 &M-125 Conn over I-75 carry?

About 2,700 vehicles per day (1995 count), of which roughly 6% are trucks.

How long is I-75 &M-125 Conn over I-75?

The structure is 476 ft (145.1 m) long with a longest span of 132 ft (40.2 m) and a deck 27 ft wide.

Who owns I-75 &M-125 Conn over I-75?

It is owned by the State Highway Agency.