US Bridges

I-75 NB over Laplaisance Creek

Fair

Monroe County, Michigan · 4.2 MI SW of M-50 · Structure no. 000000000007164

Built
1954
71 years old, rebuilt 1974
Condition
Fair
inspected June 2023
Type
Tee Beam
Concrete
Length
35 ft
1 main span
Daily traffic
30,558
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over Laplaisance Creek is a concrete tee beam carrying I-75 NB over Laplaisance Creek in Monroe County, Michigan. It was built in 1954 and reconstructed in 1974, so it is 71 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 30,558 vehicles a day, roughly 24% of them trucks, projected to reach 34,683 by 2018. The structure is 35 ft (10.6 m) long and 58 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-75 NB
CrossesLaplaisance Creek
Location4.2 MI SW of M-50
RouteInterstate 75
CountyMonroe County
StateMichigan
Coordinates41.87499, -83.39741
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
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 alignment7: Better than present minimum criteria
Operating rating79.3 US tons
Inventory rating47.8 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length35 ft (10.6 m)
Longest span35 ft (10.6 m)
Deck width58 ft (17.8 m)
Roadway width57 ft (17.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,558 (2007)
Projected traffic34,683 by 2018
Trucks24%
Lanes on structure3
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 NB over Laplaisance Creek built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1974.

What condition is I-75 NB 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 over Laplaisance Creek carry?

About 30,558 vehicles per day (2007 count), of which roughly 24% are trucks.

How long is I-75 NB over Laplaisance Creek?

The structure is 35 ft (10.6 m) long with a longest span of 35 ft (10.6 m) and a deck 58 ft wide.

Who owns I-75 NB over Laplaisance Creek?

It is owned by the State Highway Agency.