S 366-LEDGER RD over Drainage
FairPondera County, Montana · 4M W Ledger · Structure no. S00366002+03001
- Built
- 1954
- 71 years old, rebuilt 1964
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 26 ft
- 1 main span
- Daily traffic
- 187
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 366-LEDGER RD over Drainage is a wood or timber stringer/multi-beam or girder carrying S 366-LEDGER RD over Drainage in Pondera County, Montana. It was built in 1954 and reconstructed in 1964, so it is 71 years old, older 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 6 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 187 vehicles a day, roughly 4% of them trucks, projected to reach 196 by 2043. The structure is 26 ft (7.9 m) long and 34 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
| 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 S 366-LEDGER RD over Drainage built?
It was built in 1954, making it 71 years old in 2025. It was reconstructed in 1964.
What condition is S 366-LEDGER RD over Drainage 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 September 2023.
How much traffic does S 366-LEDGER RD over Drainage carry?
About 187 vehicles per day (2023 count), of which roughly 4% are trucks.
How long is S 366-LEDGER RD over Drainage?
The structure is 26 ft (7.9 m) long with a longest span of 25 ft (7.6 m) and a deck 34 ft wide.
Who owns S 366-LEDGER RD over Drainage?
It is owned by the State Highway Agency.