US Bridges

I-675 NB over I-75

Fair

Saginaw County, Michigan · @ S JCT I-75 · Structure no. 000000000009125

Built
1971
54 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
270 ft
4 main spans
Daily traffic
9,369
2017 count
Owner
State
State Highway Agency

About this bridge

I-675 NB over I-75 is a steel stringer/multi-beam or girder carrying I-675 NB over I-75 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 9,369 vehicles a day, roughly 9% of them trucks, projected to reach 10,774 by 2037. The structure is 270 ft (82.3 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 NB
CrossesI-75
Location@ S JCT I-75
RouteInterstate 675
CountySaginaw County
StateMichigan
Coordinates43.43363, -83.89066
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.3 US tons
Inventory rating53.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length270 ft (82.3 m)
Longest span98 ft (30 m)
Deck width43 ft (13.1 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,369 (2017)
Projected traffic10,774 by 2037
Trucks9%
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 NB over I-75 built?

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

What condition is I-675 NB over I-75 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 NB over I-75 carry?

About 9,369 vehicles per day (2017 count), of which roughly 9% are trucks.

How long is I-675 NB over I-75?

The structure is 270 ft (82.3 m) long with a longest span of 98 ft (30 m) and a deck 43 ft wide.

Who owns I-675 NB over I-75?

It is owned by the State Highway Agency.