Old M-76 over Au Sable River
FairRoscommon County, Michigan · Section 5 T23N R1W · Structure no. 000000000009034
- Built
- 1949
- 76 years old
- Condition
- Fair
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 40 ft
- 1 main span
- Daily traffic
- 1,543
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
Old M-76 over Au Sable River is a steel stringer/multi-beam or girder carrying Old M-76 over Au Sable River in Roscommon County, Michigan. It was built in 1949, so it is 76 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 1,543 vehicles a day, roughly 5% of them trucks, projected to reach 2,293 by 2041. The structure is 40 ft (12.2 m) long and 47 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old M-76 over Au Sable River built?
It was built in 1949, making it 76 years old in 2025.
What condition is Old M-76 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 June 2024.
How much traffic does Old M-76 over Au Sable River carry?
About 1,543 vehicles per day (2021 count), of which roughly 5% are trucks.
How long is Old M-76 over Au Sable River?
The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.8 m) and a deck 47 ft wide.
Who owns Old M-76 over Au Sable River?
It is owned by the County Highway Agency.