M-123 over Carp River
FairMackinac County, Michigan · 2.8 MI NW of Green · Structure no. 000000000005973
- Built
- 1961
- 64 years old
- Condition
- Fair
- inspected July 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 46 ft
- 1 main span
- Daily traffic
- 1,041
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
M-123 over Carp River is a steel stringer/multi-beam or girder carrying M-123 over Carp River in Mackinac County, Michigan. It was built in 1961, 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 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 1,041 vehicles a day, roughly 8% of them trucks, projected to reach 1,293 by 2018. The structure is 46 ft (13.9 m) long and 43 ft wide. If it were closed, the detour would be 29.8 mi (48 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was M-123 over Carp River built?
It was built in 1961, making it 64 years old in 2025.
What condition is M-123 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 July 2023.
How much traffic does M-123 over Carp River carry?
About 1,041 vehicles per day (2007 count), of which roughly 8% are trucks.
How long is M-123 over Carp River?
The structure is 46 ft (13.9 m) long with a longest span of 44 ft (13.4 m) and a deck 43 ft wide.
Who owns M-123 over Carp River?
It is owned by the State Highway Agency.