N Montana Ave over Helena Valley Canal
FairLewis and Clark County, Montana · 1M N Helena · Structure no. U05809002+02701
- Built
- 1958
- 67 years old, rebuilt 2005
- Condition
- Fair
- inspected December 2024
- Type
- Slab
- Concrete
- Length
- 25 ft
- 1 main span
- Daily traffic
- 11,167
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
N Montana Ave over Helena Valley Canal is a concrete slab carrying N Montana Ave over Helena Valley Canal in Lewis and Clark County, Montana. It was built in 1958 and reconstructed in 2005, so it is 67 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 6 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 11,167 vehicles a day, roughly 1% of them trucks, projected to reach 11,725 by 2043. The structure is 25 ft (7.5 m) long and 56 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 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 N Montana Ave over Helena Valley Canal built?
It was built in 1958, making it 67 years old in 2025. It was reconstructed in 2005.
What condition is N Montana Ave over Helena Valley Canal 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 December 2024.
How much traffic does N Montana Ave over Helena Valley Canal carry?
About 11,167 vehicles per day (2023 count), of which roughly 1% are trucks.
How long is N Montana Ave over Helena Valley Canal?
The structure is 25 ft (7.5 m) long with a longest span of 23 ft (7.1 m) and a deck 56 ft wide.
Who owns N Montana Ave over Helena Valley Canal?
It is owned by the State Highway Agency.