S 556-THOMPSON R R over Thompson River
GoodSanders County, Montana · 30M SW Marion · Structure no. S00556033+00311
- Built
- 1988
- 37 years old
- Condition
- Good
- inspected August 2024
- Type
- Culvert
- Steel
- Length
- 31 ft
- 1 main span
- Daily traffic
- 56
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
S 556-THOMPSON R R over Thompson River is a steel culvert carrying S 556-THOMPSON R R over Thompson River in Sanders County, Montana. It was built in 1988, so it is 37 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 56 vehicles a day, projected to reach 59 by 2043. The structure is 31 ft (9.6 m) long. If it were closed, the detour would be 29.8 mi (48 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 556-THOMPSON R R over Thompson River built?
It was built in 1988, making it 37 years old in 2025.
What condition is S 556-THOMPSON R R over Thompson River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.
How much traffic does S 556-THOMPSON R R over Thompson River carry?
About 56 vehicles per day (2023 count).
How long is S 556-THOMPSON R R over Thompson River?
The structure is 31 ft (9.6 m) long with a longest span of 31 ft (9.6 m).
Who owns S 556-THOMPSON R R over Thompson River?
It is owned by the County Highway Agency.