S 83 FH 15 over Lost Creek
PoorLake County, Montana · 3M S Swan Lake · Structure no. P00083067+02881
- Built
- 1953
- 72 years old
- Condition
- Poor
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 58 ft
- 3 main spans
- Daily traffic
- 1,246
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 83 FH 15 over Lost Creek is a wood or timber stringer/multi-beam or girder carrying S 83 FH 15 over Lost Creek in Lake County, Montana. It was built in 1953, so it is 72 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 1,246 vehicles a day, roughly 6% of them trucks, projected to reach 1,308 by 2043. The structure is 58 ft (17.7 m) long and 31 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 83 FH 15 over Lost Creek built?
It was built in 1953, making it 72 years old in 2025.
What condition is S 83 FH 15 over Lost Creek 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 August 2024.
How much traffic does S 83 FH 15 over Lost Creek carry?
About 1,246 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is S 83 FH 15 over Lost Creek?
The structure is 58 ft (17.7 m) long with a longest span of 19 ft (5.8 m) and a deck 31 ft wide.
Who owns S 83 FH 15 over Lost Creek?
It is owned by the State Highway Agency.