Main Boulder RD over Four Mile Creek 039
FairPark County, Montana · 30M S Springdale · Structure no. L34210000+03001
- Built
- 1938
- 87 years old
- Condition
- Fair
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 31 ft
- 1 main span
- Daily traffic
- 157
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Main Boulder RD over Four Mile Creek 039 is a wood or timber stringer/multi-beam or girder carrying Main Boulder RD over Four Mile Creek 039 in Park County, Montana. It was built in 1938, so it is 87 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 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 157 vehicles a day, roughly 17% of them trucks, projected to reach 165 by 2043. The structure is 31 ft (9.4 m) long and 25 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 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 | 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 Main Boulder RD over Four Mile Creek 039 built?
It was built in 1938, making it 87 years old in 2025.
What condition is Main Boulder RD over Four Mile Creek 039 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 2024.
How much traffic does Main Boulder RD over Four Mile Creek 039 carry?
About 157 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is Main Boulder RD over Four Mile Creek 039?
The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 25 ft wide.
Who owns Main Boulder RD over Four Mile Creek 039?
It is owned by the County Highway Agency.