Lake Como RD over Rock Creek 100
GoodRavalli County, Montana · 4M N Darby · Structure no. L41704000+03001
- Built
- 1977
- 48 years old
- Condition
- Good
- inspected August 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 79 ft
- 1 main span
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
Lake Como RD over Rock Creek 100 is a prestressed concrete tee beam carrying Lake Como RD over Rock Creek 100 in Ravalli County, Montana. It was built in 1977, so it is 48 years old, older 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 7 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 79 ft (24.1 m) long and 31 ft wide. If it were closed, the detour would be 8.1 mi (13 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Lake Como RD over Rock Creek 100 built?
It was built in 1977, making it 48 years old in 2025.
What condition is Lake Como RD over Rock Creek 100 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 August 2023.
How much traffic does Lake Como RD over Rock Creek 100 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Lake Como RD over Rock Creek 100?
The structure is 79 ft (24.1 m) long with a longest span of 75 ft (22.9 m) and a deck 31 ft wide.
Who owns Lake Como RD over Rock Creek 100?
It is owned by the County Highway Agency.