Mt 55 over Fish Creek
PoorJefferson County, Montana · 9M SW Whitehall · Structure no. P00055003+06271
- Built
- 1953
- 72 years old
- Condition
- Poor
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 38 ft
- 2 main spans
- Daily traffic
- 1,858
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
Mt 55 over Fish Creek is a wood or timber stringer/multi-beam or girder carrying Mt 55 over Fish Creek in Jefferson 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 1,858 vehicles a day, roughly 15% of them trucks, projected to reach 1,969 by 2043. The structure is 38 ft (11.6 m) long and 26 ft wide. If it were closed, the detour would be 29.2 mi (47 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mt 55 over Fish Creek built?
It was built in 1953, making it 72 years old in 2025.
What condition is Mt 55 over Fish 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 September 2024.
How much traffic does Mt 55 over Fish Creek carry?
About 1,858 vehicles per day (2023 count), of which roughly 15% are trucks.
How long is Mt 55 over Fish Creek?
The structure is 38 ft (11.6 m) long with a longest span of 19 ft (5.8 m) and a deck 26 ft wide.
Who owns Mt 55 over Fish Creek?
It is owned by the State Highway Agency.