US Bridges

I-75 (nb Ex Ramp) over Laplaisance Creek

Fair

Monroe County, Michigan · 4.2 MI SW of M-50 · Structure no. 000000000007169

Built
1975
50 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
68 ft
1 main span
Daily traffic
51,000
1993 count
Owner
State
State Highway Agency

About this bridge

I-75 (nb Ex Ramp) over Laplaisance Creek is a steel stringer/multi-beam or girder carrying I-75 (nb Ex Ramp) over Laplaisance 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 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 51,000 vehicles a day, roughly 27% of them trucks, projected to reach 58,650 by 2013. The structure is 68 ft (20.7 m) long and 27 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 (nb Ex Ramp)
CrossesLaplaisance Creek
Location4.2 MI SW of M-50
RouteInterstate 75
CountyMonroe County
StateMichigan
Coordinates41.87465, -83.39691
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating107.1 US tons
Inventory rating71.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length68 ft (20.7 m)
Longest span68 ft (20.7 m)
Deck width27 ft (8.3 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51,000 (1993)
Projected traffic58,650 by 2013
Trucks27%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-75 (nb Ex Ramp) over Laplaisance Creek built?

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

What condition is I-75 (nb Ex Ramp) over Laplaisance 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 (nb Ex Ramp) over Laplaisance Creek carry?

About 51,000 vehicles per day (1993 count), of which roughly 27% are trucks.

How long is I-75 (nb Ex Ramp) over Laplaisance Creek?

The structure is 68 ft (20.7 m) long with a longest span of 68 ft (20.7 m) and a deck 27 ft wide.

Who owns I-75 (nb Ex Ramp) over Laplaisance Creek?

It is owned by the State Highway Agency.