US Bridges

NB I-75 Bl over I-75 SB

Fair

Crawford County, Michigan · @ S JCT I-75 Bl · Structure no. 000000000002035

Built
1961
64 years old, rebuilt 2008
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
203 ft
3 main spans
Daily traffic
4,810
2007 count
Owner
State
State Highway Agency

About this bridge

NB I-75 Bl over I-75 SB is a steel stringer/multi-beam or girder carrying NB I-75 Bl over I-75 SB in Crawford County, Michigan. It was built in 1961 and reconstructed in 2008, so it is 64 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 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 4,810 vehicles a day, roughly 10% of them trucks, projected to reach 4,887 by 2018. The structure is 203 ft (61.9 m) long and 26 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesNB I-75 Bl
CrossesI-75 SB
Location@ S JCT I-75 Bl
RouteInterstate 75
CountyCrawford County
StateMichigan
Coordinates44.6447, -84.70786
Functional classRural 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating82.9 US tons
Inventory rating49.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length203 ft (61.9 m)
Longest span88 ft (26.8 m)
Deck width26 ft (7.9 m)
Roadway width22 ft (6.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,810 (2007)
Projected traffic4,887 by 2018
Trucks10%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

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 NB I-75 Bl over I-75 SB built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 2008.

What condition is NB I-75 Bl over I-75 SB 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 September 2023.

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

About 4,810 vehicles per day (2007 count), of which roughly 10% are trucks.

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

The structure is 203 ft (61.9 m) long with a longest span of 88 ft (26.8 m) and a deck 26 ft wide.

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

It is owned by the State Highway Agency.