US-31 (old) over Pentwater River
FairOceana County, Michigan · N Lts of Hart · Structure no. 000000000008318
- Built
- 1954
- 71 years old, rebuilt 2008
- Condition
- Fair
- inspected November 2023
- Type
- Girder and Floorbeam System
- Steel
- Length
- 270 ft
- 3 main spans
- Daily traffic
- 4,200
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
US-31 (old) over Pentwater River is a steel girder and floorbeam system carrying US-31 (old) over Pentwater River in Oceana County, Michigan. It was built in 1954 and reconstructed in 2008, so it is 71 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 4,200 vehicles a day, roughly 3% of them trucks, projected to reach 4,650 by 2040. The structure is 270 ft (82.3 m) long and 63 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 US-31 (old) over Pentwater River built?
It was built in 1954, making it 71 years old in 2025. It was reconstructed in 2008.
What condition is US-31 (old) over Pentwater 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 November 2023.
How much traffic does US-31 (old) over Pentwater River carry?
About 4,200 vehicles per day (2019 count), of which roughly 3% are trucks.
How long is US-31 (old) over Pentwater River?
The structure is 270 ft (82.3 m) long with a longest span of 102 ft (31.1 m) and a deck 63 ft wide.
Who owns US-31 (old) over Pentwater River?
It is owned by the State Highway Agency.