IRR - S 480 over Long Grass Creek
GoodRichland County, Montana · 20M N Richey · Structure no. S00480018+00001
- Built
- 1984
- 41 years old
- Condition
- Good
- inspected November 2023
- Type
- Channel Beam
- Prestressed Concrete
- Length
- 30 ft
- 1 main span
- Daily traffic
- 22
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
IRR - S 480 over Long Grass Creek is a prestressed concrete channel beam carrying IRR - S 480 over Long Grass Creek in Richland County, Montana. It was built in 1984, so it is 41 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 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 22 vehicles a day, roughly 14% of them trucks, projected to reach 23 by 2043. The structure is 30 ft (9.1 m) long and 28 ft wide. If it were closed, the detour would be 75.8 mi (122 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was IRR - S 480 over Long Grass Creek built?
It was built in 1984, making it 41 years old in 2025.
What condition is IRR - S 480 over Long Grass Creek 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 November 2023.
How much traffic does IRR - S 480 over Long Grass Creek carry?
About 22 vehicles per day (2023 count), of which roughly 14% are trucks.
How long is IRR - S 480 over Long Grass Creek?
The structure is 30 ft (9.1 m) long with a longest span of 29 ft (8.8 m) and a deck 28 ft wide.
Who owns IRR - S 480 over Long Grass Creek?
It is owned by the County Highway Agency.