US Bridges

I-475 NB over Clio RD

Fair

Genesee County, Michigan · 1.5 MI E of N JCT I-75 · Structure no. 000000000002691

Built
1971
54 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
167 ft
4 main spans
Daily traffic
13,300
2007 count
Owner
State
State Highway Agency

About this bridge

I-475 NB over Clio RD is a prestressed concrete stringer/multi-beam or girder carrying I-475 NB over Clio RD in Genesee County, Michigan. It was built in 1971, 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 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 13,300 vehicles a day, roughly 9% of them trucks, projected to reach 12,845 by 2018. The structure is 167 ft (50.8 m) long and 69 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-475 NB
CrossesClio RD
Location1.5 MI E of N JCT I-75
RouteInterstate 475
CountyGenesee County
StateMichigan
Coordinates43.09651, -83.73376
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2025
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 rating58.5 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length167 ft (50.8 m)
Longest span54 ft (16.4 m)
Deck width69 ft (21 m)
Roadway width66 ft (20 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,300 (2007)
Projected traffic12,845 by 2018
Trucks9%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-475 NB over Clio RD built?

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

What condition is I-475 NB over Clio RD 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 February 2025.

How much traffic does I-475 NB over Clio RD carry?

About 13,300 vehicles per day (2007 count), of which roughly 9% are trucks.

How long is I-475 NB over Clio RD?

The structure is 167 ft (50.8 m) long with a longest span of 54 ft (16.4 m) and a deck 69 ft wide.

Who owns I-475 NB over Clio RD?

It is owned by the State Highway Agency.