US Bridges

I-475 Rmp to I-75 over I-475RAMP B & I-75

Fair

Genesee County, Michigan · N JCT I-75 · Structure no. 000000000002683

Built
1971
54 years old, rebuilt 2010
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
394 ft
4 main spans
Daily traffic
3,100
1988 count
Owner
State
State Highway Agency

About this bridge

I-475 Rmp to I-75 over I-475RAMP B & I-75 is a steel stringer/multi-beam or girder carrying I-475 Rmp to I-75 over I-475RAMP B & I-75 in Genesee County, Michigan. It was built in 1971 and reconstructed in 2010, so it is 54 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 3,100 vehicles a day, roughly 7% of them trucks, projected to reach 3,565 by 2008. The structure is 394 ft (120.1 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI-475 Rmp to I-75
CrossesI-475RAMP B & I-75
LocationN JCT I-75
RouteInterstate 75
CountyGenesee County
StateMichigan
Coordinates43.09776, -83.76301
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.5 US tons
Inventory rating40.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length394 ft (120.1 m)
Longest span107 ft (32.6 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (1988)
Projected traffic3,565 by 2008
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesThird level (interchange)
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-475 Rmp to I-75 over I-475RAMP B & I-75 built?

It was built in 1971, making it 54 years old in 2025. It was reconstructed in 2010.

What condition is I-475 Rmp to I-75 over I-475RAMP B & 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 September 2024.

How much traffic does I-475 Rmp to I-75 over I-475RAMP B & I-75 carry?

About 3,100 vehicles per day (1988 count), of which roughly 7% are trucks.

How long is I-475 Rmp to I-75 over I-475RAMP B & I-75?

The structure is 394 ft (120.1 m) long with a longest span of 107 ft (32.6 m) and a deck 44 ft wide.

Who owns I-475 Rmp to I-75 over I-475RAMP B & I-75?

It is owned by the State Highway Agency.