US Bridges

I-475 SB over I-75 NB

Poor

Genesee County, Michigan · 4.5 MI S of Flint · Structure no. 000000000002648

Built
1971
54 years old
Condition
Poor
inspected January 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
188 ft
3 main spans
Daily traffic
13,158
2007 count
Owner
State
State Highway Agency

About this bridge

I-475 SB over I-75 NB is a steel stringer/multi-beam or girder carrying I-475 SB over I-75 NB 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 13,158 vehicles a day, roughly 8% of them trucks, projected to reach 17,501 by 2018. The structure is 188 ft (57.3 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-475 SB
CrossesI-75 NB
Location4.5 MI S of Flint
RouteInterstate 475
CountyGenesee County
StateMichigan
Coordinates42.92271, -83.681
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating44.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length188 ft (57.3 m)
Longest span107 ft (32.6 m)
Deck width44 ft (13.3 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,158 (2007)
Projected traffic17,501 by 2018
Trucks8%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkNon-Interstate 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 SB over I-75 NB built?

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

What condition is I-475 SB over I-75 NB in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.

How much traffic does I-475 SB over I-75 NB carry?

About 13,158 vehicles per day (2007 count), of which roughly 8% are trucks.

How long is I-475 SB over I-75 NB?

The structure is 188 ft (57.3 m) long with a longest span of 107 ft (32.6 m) and a deck 44 ft wide.

Who owns I-475 SB over I-75 NB?

It is owned by the State Highway Agency.