US Bridges

US-2|I-75 Bl over I-75 NB

Fair

Mackinac County, Michigan · In ST Ignace I-75 · Structure no. 000000000005949

Built
1957
68 years old, rebuilt 1997
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
192 ft
4 main spans
Daily traffic
7,550
2022 count
Owner
State
State Highway Agency

About this bridge

US-2|I-75 Bl over I-75 NB is a steel stringer/multi-beam or girder carrying US-2|I-75 Bl over I-75 NB in Mackinac County, Michigan. It was built in 1957 and reconstructed in 1997, so it is 68 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 7,550 vehicles a day, roughly 7% of them trucks, projected to reach 8,825 by 2043. The structure is 192 ft (58.6 m) long and 80 ft wide.

Location

Open in Google Maps
CarriesUS-2|I-75 Bl
CrossesI-75 NB
LocationIn ST Ignace I-75
RouteU.S. Route 2
CountyMackinac County
StateMichigan
Coordinates45.85763, -84.72795
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 12 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 geometry7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating81.8 US tons
Inventory rating48.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length192 ft (58.6 m)
Longest span65 ft (19.9 m)
Deck width80 ft (24.5 m)
Roadway width77 ft (23.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,550 (2022)
Projected traffic8,825 by 2043
Trucks7%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 US-2|I-75 Bl over I-75 NB built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1997.

What condition is US-2|I-75 Bl over I-75 NB 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 December 2024.

How much traffic does US-2|I-75 Bl over I-75 NB carry?

About 7,550 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is US-2|I-75 Bl over I-75 NB?

The structure is 192 ft (58.6 m) long with a longest span of 65 ft (19.9 m) and a deck 80 ft wide.

Who owns US-2|I-75 Bl over I-75 NB?

It is owned by the State Highway Agency.