US-23 over Au Sable River
FairIosco County, Michigan · In Au Sable · Structure no. 000000000004129
- Built
- 1972
- 53 years old, rebuilt 2004
- Condition
- Fair
- inspected July 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 232 ft
- 3 main spans
- Daily traffic
- 8,367
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
US-23 over Au Sable River is a steel stringer/multi-beam or girder carrying US-23 over Au Sable River in Iosco County, Michigan. It was built in 1972 and reconstructed in 2004, so it is 53 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 8,367 vehicles a day, roughly 2% of them trucks, projected to reach 18,500 by 2025. The structure is 232 ft (70.7 m) long and 56 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| 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 US-23 over Au Sable River built?
It was built in 1972, making it 53 years old in 2025. It was reconstructed in 2004.
What condition is US-23 over Au Sable 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 US-23 over Au Sable River carry?
About 8,367 vehicles per day (2007 count), of which roughly 2% are trucks.
How long is US-23 over Au Sable River?
The structure is 232 ft (70.7 m) long with a longest span of 84 ft (25.5 m) and a deck 56 ft wide.
Who owns US-23 over Au Sable River?
It is owned by the State Highway Agency.