US Bridges

I-675 SB over Michigan Ave

Fair

Saginaw County, Michigan · In Saginaw · Structure no. 000000000009138

Built
1971
54 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
197 ft
3 main spans
Daily traffic
13,032
2017 count
Owner
State
State Highway Agency

About this bridge

I-675 SB over Michigan Ave is a steel stringer/multi-beam or girder carrying I-675 SB over Michigan Ave in Saginaw 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 13,032 vehicles a day, roughly 6% of them trucks, projected to reach 14,987 by 2037. The structure is 197 ft (60 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-675 SB
CrossesMichigan Ave
LocationIn Saginaw
RouteInterstate 675
CountySaginaw County
StateMichigan
Coordinates43.44037, -83.94954
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72.5 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length197 ft (60 m)
Longest span90 ft (27.4 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,032 (2017)
Projected traffic14,987 by 2037
Trucks6%
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 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-675 SB over Michigan Ave built?

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

What condition is I-675 SB over Michigan Ave 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 November 2024.

How much traffic does I-675 SB over Michigan Ave carry?

About 13,032 vehicles per day (2017 count), of which roughly 6% are trucks.

How long is I-675 SB over Michigan Ave?

The structure is 197 ft (60 m) long with a longest span of 90 ft (27.4 m) and a deck 43 ft wide.

Who owns I-675 SB over Michigan Ave?

It is owned by the State Highway Agency.