Old US-31 over Pere Marquette River
FairMason County, Michigan · 2.3 MI S of US-10 · Structure no. 000000000006636
- Built
- 1924
- 101 years old, rebuilt 2000
- Condition
- Fair
- inspected May 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 75 ft
- 1 main span
- Daily traffic
- 6,828
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
Old US-31 over Pere Marquette River is a prestressed concrete box beam or girders - multiple carrying Old US-31 over Pere Marquette River in Mason County, Michigan. It was built in 1924 and reconstructed in 2000, so it is 101 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 6,828 vehicles a day, roughly 7% of them trucks, projected to reach 8,942 by 2018. The structure is 75 ft (22.9 m) long and 41 ft wide. If it were closed, the detour would be 16.8 mi (27 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old US-31 over Pere Marquette River built?
It was built in 1924, making it 101 years old in 2025. It was reconstructed in 2000.
What condition is Old US-31 over Pere Marquette 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 May 2024.
How much traffic does Old US-31 over Pere Marquette River carry?
About 6,828 vehicles per day (2007 count), of which roughly 7% are trucks.
How long is Old US-31 over Pere Marquette River?
The structure is 75 ft (22.9 m) long with a longest span of 74 ft (22.6 m) and a deck 41 ft wide.
Who owns Old US-31 over Pere Marquette River?
It is owned by the State Highway Agency.