M-32 over S Br Thunder Bay River
GoodAlpena County, Michigan · 4.7 MI E Montmorency Col · Structure no. 000000000000328
- Built
- 1932
- 93 years old, rebuilt 2009
- Condition
- Good
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 50 ft
- 1 main span
- Daily traffic
- 4,144
- 2006 count
- Owner
- State
- State Highway Agency
About this bridge
M-32 over S Br Thunder Bay River is a prestressed concrete stringer/multi-beam or girder carrying M-32 over S Br Thunder Bay River in Alpena County, Michigan. It was built in 1932 and reconstructed in 2009, so it is 93 years old, older than the Michigan average of 48.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 4,144 vehicles a day, roughly 1% of them trucks, projected to reach 6,114 by 2018. The structure is 50 ft (15.2 m) long and 42 ft wide. If it were closed, the detour would be 24.9 mi (40 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was M-32 over S Br Thunder Bay River built?
It was built in 1932, making it 93 years old in 2025. It was reconstructed in 2009.
What condition is M-32 over S Br Thunder Bay River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.
How much traffic does M-32 over S Br Thunder Bay River carry?
About 4,144 vehicles per day (2006 count), of which roughly 1% are trucks.
How long is M-32 over S Br Thunder Bay River?
The structure is 50 ft (15.2 m) long with a longest span of 48 ft (14.7 m) and a deck 42 ft wide.
Who owns M-32 over S Br Thunder Bay River?
It is owned by the State Highway Agency.