US Bridges

I-475 over Saginaw Street

Fair

Genesee County, Michigan · 1.7 MI N / Flint City Lts · Structure no. 000000000002681

Built
1977
48 years old
Condition
Fair
inspected February 2025
Type
Stringer/Multi-beam or Girder
Steel
Length
174 ft
4 main spans
Daily traffic
31,300
2007 count
Owner
State
State Highway Agency

About this bridge

I-475 over Saginaw Street is a steel stringer/multi-beam or girder carrying I-475 over Saginaw Street in Genesee County, Michigan. It was built in 1977, so it is 48 years old, younger 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 31,300 vehicles a day, roughly 8% of them trucks, projected to reach 28,209 by 2018. The structure is 174 ft (52.9 m) long and 116 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI-475
CrossesSaginaw Street
Location1.7 MI N / Flint City Lts
RouteInterstate 475
CountyGenesee County
StateMichigan
Coordinates43.09898, -83.69424
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.
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 rating98.2 US tons
Inventory rating58.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length174 ft (52.9 m)
Longest span56 ft (17 m)
Deck width116 ft (35.3 m)
Roadway width114 ft (34.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic31,300 (2007)
Projected traffic28,209 by 2018
Trucks8%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 proposedDeck replacement with only incidental widening
Estimated improvement cost$114,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-475 over Saginaw Street built?

It was built in 1977, making it 48 years old in 2025.

What condition is I-475 over Saginaw Street 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 over Saginaw Street carry?

About 31,300 vehicles per day (2007 count), of which roughly 8% are trucks.

How long is I-475 over Saginaw Street?

The structure is 174 ft (52.9 m) long with a longest span of 56 ft (17 m) and a deck 116 ft wide.

Who owns I-475 over Saginaw Street?

It is owned by the State Highway Agency.