US Bridges

I-75 Ramp B over I-75

Fair

Monroe County, Michigan · 1.6 MI N of State Line · Structure no. 000000000007187

Built
1976
49 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
416 ft
4 main spans
Daily traffic
1,456
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 Ramp B over I-75 is a steel stringer/multi-beam or girder carrying I-75 Ramp B over I-75 in Monroe County, Michigan. It was built in 1976, so it is 49 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 1,456 vehicles a day, roughly 27% of them trucks, projected to reach 6,240 by 2020. The structure is 416 ft (126.8 m) long and 27 ft wide.

Location

Open in Google Maps
CarriesI-75 Ramp B
CrossesI-75
Location1.6 MI N of State Line
RouteInterstate 75
CountyMonroe County
StateMichigan
Coordinates41.7682, -83.4807
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating85.3 US tons
Inventory rating51 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length416 ft (126.8 m)
Longest span152 ft (46.3 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,456 (2007)
Projected traffic6,240 by 2020
Trucks27%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 Ramp B over I-75 built?

It was built in 1976, making it 49 years old in 2025.

What condition is I-75 Ramp B over I-75 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 Ramp B over I-75 carry?

About 1,456 vehicles per day (2007 count), of which roughly 27% are trucks.

How long is I-75 Ramp B over I-75?

The structure is 416 ft (126.8 m) long with a longest span of 152 ft (46.3 m) and a deck 27 ft wide.

Who owns I-75 Ramp B over I-75?

It is owned by the State Highway Agency.