US Bridges

I-475 over Atherton RD

Fair

Genesee County, Michigan · In Flint · Structure no. 000000000002653

Built
1971
54 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
120 ft
3 main spans
Daily traffic
33,250
2016 count
Owner
State
State Highway Agency

About this bridge

I-475 over Atherton RD is a prestressed concrete stringer/multi-beam or girder carrying I-475 over Atherton 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 33,250 vehicles a day, roughly 5% of them trucks, projected to reach 36,700 by 2036. The structure is 120 ft (36.6 m) long and 122 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-475
CrossesAtherton RD
LocationIn Flint
RouteInterstate 475
CountyGenesee County
StateMichigan
Coordinates42.98887, -83.68244
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.
Substructure7 GoodSome minor problems.
Last inspectionAugust 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 rating56.4 US tons
Inventory rating33.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length120 ft (36.6 m)
Longest span61 ft (18.7 m)
Deck width122 ft (37.2 m)
Roadway width115 ft (35.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic33,250 (2016)
Projected traffic36,700 by 2036
Trucks5%
Lanes on structure6
Traffic directionTwo-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 over Atherton RD built?

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

What condition is I-475 over Atherton 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 August 2024.

How much traffic does I-475 over Atherton RD carry?

About 33,250 vehicles per day (2016 count), of which roughly 5% are trucks.

How long is I-475 over Atherton RD?

The structure is 120 ft (36.6 m) long with a longest span of 61 ft (18.7 m) and a deck 122 ft wide.

Who owns I-475 over Atherton RD?

It is owned by the State Highway Agency.