Main Boulder Road over Boulder River
PoorClosed to trafficPark County, Montana · 38 M South of Springdale · Structure no. 000000202208055
- Built
- 1950
- 75 years old
- Condition
- Poor
- inspected September 2024
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 30 ft
- 1 main span
- Daily traffic
- 157
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Main Boulder Road over Boulder River is a wood or timber stringer/multi-beam or girder carrying Main Boulder Road over Boulder River in Park County, Montana. It was built in 1950, so it is 75 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 3 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. Its operating status is: closed to all traffic.
It carries about 157 vehicles a day, roughly 17% of them trucks, projected to reach 165 by 2043. The structure is 30 ft (9.2 m) long and 15 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Main Boulder Road over Boulder River built?
It was built in 1950, making it 75 years old in 2025.
What condition is Main Boulder Road over Boulder River 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 Main Boulder Road over Boulder River carry?
About 157 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is Main Boulder Road over Boulder River?
The structure is 30 ft (9.2 m) long with a longest span of 28 ft (8.4 m) and a deck 15 ft wide.
Who owns Main Boulder Road over Boulder River?
It is owned by the County Highway Agency.