S 37 FH 57 over Rock Gut
PoorLincoln County, Montana · 22M N Libby Dam · Structure no. P00033037+09261
- Built
- 1974
- 51 years old
- Condition
- Poor
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 269 ft
- 3 main spans
- Daily traffic
- 346
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 37 FH 57 over Rock Gut is a prestressed concrete stringer/multi-beam or girder carrying S 37 FH 57 over Rock Gut in Lincoln County, Montana. It was built in 1974, so it is 51 years old, older than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 346 vehicles a day, roughly 6% of them trucks, projected to reach 363 by 2043. The structure is 269 ft (82 m) long and 40 ft wide. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 37 FH 57 over Rock Gut built?
It was built in 1974, making it 51 years old in 2025.
What condition is S 37 FH 57 over Rock Gut in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.
How much traffic does S 37 FH 57 over Rock Gut carry?
About 346 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is S 37 FH 57 over Rock Gut?
The structure is 269 ft (82 m) long with a longest span of 90 ft (27.4 m) and a deck 40 ft wide.
Who owns S 37 FH 57 over Rock Gut?
It is owned by the State Highway Agency.