US-31 over Platte River
FairBenzie County, Michigan · 3.9 MI E of Honor · Structure no. 000000000000757
- Built
- 1926
- 99 years old, rebuilt 1999
- Condition
- Fair
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 60 ft
- 1 main span
- Daily traffic
- 11,984
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
US-31 over Platte River is a steel stringer/multi-beam or girder carrying US-31 over Platte River in Benzie County, Michigan. It was built in 1926 and reconstructed in 1999, so it is 99 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 11,984 vehicles a day, roughly 5% of them trucks. The structure is 60 ft (18.3 m) long and 37 ft wide. If it were closed, the detour would be 11.8 mi (19 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US-31 over Platte River built?
It was built in 1926, making it 99 years old in 2025. It was reconstructed in 1999.
What condition is US-31 over Platte 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 2024.
How much traffic does US-31 over Platte River carry?
About 11,984 vehicles per day (2022 count), of which roughly 5% are trucks.
How long is US-31 over Platte River?
The structure is 60 ft (18.3 m) long with a longest span of 27 ft (8.3 m) and a deck 37 ft wide.
Who owns US-31 over Platte River?
It is owned by the State Highway Agency.