Cobb Hill RD over Hyalite Creek 050
FairPosted for loadGallatin County, Montana · 4M W Bozeman · Structure no. L16728000+01001
- Built
- 1987
- 38 years old
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 28 ft
- 1 main span
- Daily traffic
- 100
- 2025 count
- Owner
- County
- County Highway Agency
About this bridge
Cobb Hill RD over Hyalite Creek 050 is a wood or timber stringer/multi-beam or girder carrying Cobb Hill RD over Hyalite Creek 050 in Gallatin County, Montana. It was built in 1987, so it is 38 years old, younger 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.
It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 28 ft (8.5 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Cobb Hill RD over Hyalite Creek 050 built?
It was built in 1987, making it 38 years old in 2025.
What condition is Cobb Hill RD over Hyalite Creek 050 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 June 2023.
How much traffic does Cobb Hill RD over Hyalite Creek 050 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Cobb Hill RD over Hyalite Creek 050?
The structure is 28 ft (8.5 m) long with a longest span of 26 ft (7.9 m) and a deck 24 ft wide.
Who owns Cobb Hill RD over Hyalite Creek 050?
It is owned by the County Highway Agency.