S 500 over North Willow Creek
GoodPetroleum County, Montana · 13M SW Mosby · Structure no. S00500023+00001
- Built
- 1975
- 50 years old
- Condition
- Good
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 118 ft
- 3 main spans
- Daily traffic
- 33
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
S 500 over North Willow Creek is a prestressed concrete stringer/multi-beam or girder carrying S 500 over North Willow Creek in Petroleum County, Montana. It was built in 1975, so it is 50 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 33 vehicles a day, roughly 15% of them trucks, projected to reach 35 by 2043. The structure is 118 ft (36 m) long and 33 ft wide. If it were closed, the detour would be 55.9 mi (90 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 500 over North Willow Creek built?
It was built in 1975, making it 50 years old in 2025.
What condition is S 500 over North Willow 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 August 2024.
How much traffic does S 500 over North Willow Creek carry?
About 33 vehicles per day (2023 count), of which roughly 15% are trucks.
How long is S 500 over North Willow Creek?
The structure is 118 ft (36 m) long with a longest span of 56 ft (17.1 m) and a deck 33 ft wide.
Who owns S 500 over North Willow Creek?
It is owned by the County Highway Agency.