US Bridges

I-75 & M-125 Conn over Flat Creek

Good

Monroe County, Michigan · I-75 SB Exit 2 Ramp · Structure no. 000000000013887

Built
1975
50 years old
Condition
Good
inspected October 2023
Type
Culvert
Concrete
Length
28 ft
2 main spans
Daily traffic
2,600
1995 count
Owner
State
State Highway Agency

About this bridge

I-75 & M-125 Conn over Flat Creek is a concrete culvert carrying I-75 & M-125 Conn over Flat Creek 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 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 2,600 vehicles a day, roughly 6% of them trucks, projected to reach 2,793 by 2015. The structure is 28 ft (8.5 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 & M-125 Conn
CrossesFlat Creek
LocationI-75 SB Exit 2 Ramp
RouteInterstate 75
CountyMonroe County
StateMichigan
Coordinates41.75778, -83.48306
Functional classRural 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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length28 ft (8.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (1995)
Projected traffic2,793 by 2015
Trucks6%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-75 & M-125 Conn over Flat Creek built?

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

What condition is I-75 & M-125 Conn over Flat Creek 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 & M-125 Conn over Flat Creek carry?

About 2,600 vehicles per day (1995 count), of which roughly 6% are trucks.

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

The structure is 28 ft (8.5 m) long with a longest span of 12 ft (3.7 m).

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

It is owned by the State Highway Agency.