S 556-THOMPSON R R over Thompson River
FairFlathead County, Montana · 25M SW Marion · Structure no. S00556037+07091
- Built
- 1994
- 31 years old
- Condition
- Fair
- inspected July 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 60 ft
- 1 main span
- Daily traffic
- 61
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
S 556-THOMPSON R R over Thompson River is a prestressed concrete tee beam carrying S 556-THOMPSON R R over Thompson River in Flathead County, Montana. It was built in 1994, so it is 31 years old, younger than the Montana average of 47 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 61 vehicles a day, projected to reach 64 by 2043. The structure is 60 ft (18.3 m) long and 26 ft wide. If it were closed, the detour would be 39.8 mi (64 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
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 1994, making it 31 years old in 2025.
What condition is S 556-THOMPSON R R over Thompson 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 2023.
How much traffic does S 556-THOMPSON R R over Thompson River carry?
About 61 vehicles per day (2023 count).
How long is S 556-THOMPSON R R over Thompson River?
The structure is 60 ft (18.3 m) long with a longest span of 59 ft (18 m) and a deck 26 ft wide.
Who owns S 556-THOMPSON R R over Thompson River?
It is owned by the County Highway Agency.