I-75 SB over Carp River
FairMackinac County, Michigan · 4.6 MI N of M-123 · Structure no. 000000000005938
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 203 ft
- 3 main spans
- Daily traffic
- 4,400
- 2010 count
- Owner
- State
- State Highway Agency
About this bridge
I-75 SB over Carp River is a steel stringer/multi-beam or girder carrying I-75 SB over Carp River in Mackinac County, Michigan. It was built in 1964, so it is 61 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 4,400 vehicles a day, roughly 9% of them trucks, projected to reach 5,300 by 2030. The structure is 203 ft (61.8 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was I-75 SB over Carp River built?
It was built in 1964, making it 61 years old in 2025.
What condition is I-75 SB over Carp River 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 June 2024.
How much traffic does I-75 SB over Carp River carry?
About 4,400 vehicles per day (2010 count), of which roughly 9% are trucks.
How long is I-75 SB over Carp River?
The structure is 203 ft (61.8 m) long with a longest span of 68 ft (20.7 m) and a deck 43 ft wide.
Who owns I-75 SB over Carp River?
It is owned by the State Highway Agency.