US 89 over Greenfields South Canal
GoodCascade County, Montana · 5M E Fairfield · Structure no. P00003017+09661
- Built
- 1960
- 65 years old
- Condition
- Good
- inspected December 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 63 ft
- 1 main span
- Daily traffic
- 1,757
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 89 over Greenfields South Canal is a prestressed concrete stringer/multi-beam or girder carrying US 89 over Greenfields South Canal in Cascade County, Montana. It was built in 1960, so it is 65 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 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 1,757 vehicles a day, roughly 3% of them trucks, projected to reach 1,845 by 2043. The structure is 63 ft (19.2 m) long and 41 ft wide. If it were closed, the detour would be 18 mi (29 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 89 over Greenfields South Canal built?
It was built in 1960, making it 65 years old in 2025.
What condition is US 89 over Greenfields South Canal 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 December 2024.
How much traffic does US 89 over Greenfields South Canal carry?
About 1,757 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is US 89 over Greenfields South Canal?
The structure is 63 ft (19.2 m) long with a longest span of 60 ft (18.3 m) and a deck 41 ft wide.
Who owns US 89 over Greenfields South Canal?
It is owned by the State Highway Agency.