US 31 SB over S Branch Pentwater River
FairOceana County, Michigan · 3 MI NW of Hart · Structure no. 000000000008334
- Built
- 1977
- 48 years old, rebuilt 1987
- Condition
- Fair
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 212 ft
- 3 main spans
- Daily traffic
- 4,171
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
US 31 SB over S Branch Pentwater River is a steel stringer/multi-beam or girder carrying US 31 SB over S Branch Pentwater River in Oceana County, Michigan. It was built in 1977 and reconstructed in 1987, so it is 48 years old, younger 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 5 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 4,171 vehicles a day, roughly 11% of them trucks, projected to reach 5,668 by 2018. The structure is 212 ft (64.6 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 SB over S Branch Pentwater River built?
It was built in 1977, making it 48 years old in 2025. It was reconstructed in 1987.
What condition is US 31 SB over S Branch 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 SB over S Branch Pentwater River carry?
About 4,171 vehicles per day (2007 count), of which roughly 11% are trucks.
How long is US 31 SB over S Branch Pentwater River?
The structure is 212 ft (64.6 m) long with a longest span of 95 ft (28.9 m) and a deck 44 ft wide.
Who owns US 31 SB over S Branch Pentwater River?
It is owned by the State Highway Agency.