US-131 SB over Gun River
FairAllegan County, Michigan · 1.5 MI N of Plainwell · Structure no. 000000000000145
- Built
- 1960
- 65 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 64 ft
- 1 main span
- Daily traffic
- 14,700
- 2013 count
- Owner
- State
- State Highway Agency
About this bridge
US-131 SB over Gun River is a prestressed concrete stringer/multi-beam or girder carrying US-131 SB over Gun River in Allegan County, Michigan. It was built in 1960, so it is 65 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 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 14,700 vehicles a day, roughly 10% of them trucks, projected to reach 17,950 by 2033. The structure is 64 ft (19.5 m) long and 47 ft wide. If it were closed, the detour would be 5 mi (8 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 | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US-131 SB over Gun River built?
It was built in 1960, making it 65 years old in 2025.
What condition is US-131 SB over Gun 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 June 2023.
How much traffic does US-131 SB over Gun River carry?
About 14,700 vehicles per day (2013 count), of which roughly 10% are trucks.
How long is US-131 SB over Gun River?
The structure is 64 ft (19.5 m) long with a longest span of 61 ft (18.5 m) and a deck 47 ft wide.
Who owns US-131 SB over Gun River?
It is owned by the State Highway Agency.