US Bridges

I-275 over Swan Creek

Fair

Monroe County, Michigan · 1.0 MI NE Carlton · Structure no. 000000000007206

Built
1973
52 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
44 ft
4 main spans
Daily traffic
19,015
2007 count
Owner
State
State Highway Agency

About this bridge

I-275 over Swan Creek is a concrete continuous culvert carrying I-275 over Swan Creek 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 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 19,015 vehicles a day, roughly 19% of them trucks, projected to reach 17,579 by 2018. The structure is 44 ft (13.4 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-275
CrossesSwan Creek
Location1.0 MI NE Carlton
RouteInterstate 275
CountyMonroe County
StateMichigan
Coordinates42.0724, -83.3674
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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length44 ft (13.4 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic19,015 (2007)
Projected traffic17,579 by 2018
Trucks19%
Lanes on structure6
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-275 over Swan Creek built?

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

What condition is I-275 over Swan Creek 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 July 2023.

How much traffic does I-275 over Swan Creek carry?

About 19,015 vehicles per day (2007 count), of which roughly 19% are trucks.

How long is I-275 over Swan Creek?

The structure is 44 ft (13.4 m) long with a longest span of 11 ft (3.3 m).

Who owns I-275 over Swan Creek?

It is owned by the State Highway Agency.