Ross Fork Road over Middle Fork Rock CR 021
GoodGranite County, Montana · 15M SW Phillipsburg · Structure no. L20067000+04001
- Built
- 1991
- 34 years old
- Condition
- Good
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 82 ft
- 1 main span
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
Ross Fork Road over Middle Fork Rock CR 021 is a prestressed concrete stringer/multi-beam or girder carrying Ross Fork Road over Middle Fork Rock CR 021 in Granite County, Montana. It was built in 1991, so it is 34 years old, younger than the Montana average of 47 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 82 ft (25 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ross Fork Road over Middle Fork Rock CR 021 built?
It was built in 1991, making it 34 years old in 2025.
What condition is Ross Fork Road over Middle Fork Rock CR 021 in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2024.
How much traffic does Ross Fork Road over Middle Fork Rock CR 021 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Ross Fork Road over Middle Fork Rock CR 021?
The structure is 82 ft (25 m) long with a longest span of 80 ft (24.4 m) and a deck 26 ft wide.
Who owns Ross Fork Road over Middle Fork Rock CR 021?
It is owned by the County Highway Agency.