US Bridges

I-75 SB over Plum Creek

Fair

Monroe County, Michigan · In Monroe · Structure no. 000000000007167

Built
1955
70 years old, rebuilt 1974
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
45 ft
1 main span
Daily traffic
31,883
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 SB over Plum Creek is a steel stringer/multi-beam or girder carrying I-75 SB over Plum Creek in Monroe County, Michigan. It was built in 1955 and reconstructed in 1974, so it is 70 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 31,883 vehicles a day, roughly 23% of them trucks, projected to reach 37,142 by 2018. The structure is 45 ft (13.7 m) long and 58 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI-75 SB
CrossesPlum Creek
LocationIn Monroe
RouteInterstate 75
CountyMonroe County
StateMichigan
Coordinates41.89356, -83.37954
Functional classUrban 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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating81.8 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span45 ft (13.7 m)
Deck width58 ft (17.8 m)
Roadway width55 ft (16.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,883 (2007)
Projected traffic37,142 by 2018
Trucks23%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 SB over Plum Creek built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 1974.

What condition is I-75 SB over Plum 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 June 2023.

How much traffic does I-75 SB over Plum Creek carry?

About 31,883 vehicles per day (2007 count), of which roughly 23% are trucks.

How long is I-75 SB over Plum Creek?

The structure is 45 ft (13.7 m) long with a longest span of 45 ft (13.7 m) and a deck 58 ft wide.

Who owns I-75 SB over Plum Creek?

It is owned by the State Highway Agency.