S 489 over Sunday Creek
FairCuster County, Montana · 3M N Miles City · Structure no. S00489004+02001
- Built
- 1961
- 64 years old
- Condition
- Fair
- inspected November 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 198 ft
- 3 main spans
- Daily traffic
- 607
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 489 over Sunday Creek is a prestressed concrete stringer/multi-beam or girder carrying S 489 over Sunday Creek in Custer County, Montana. It was built in 1961, so it is 64 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 607 vehicles a day, roughly 1% of them trucks, projected to reach 637 by 2043. The structure is 198 ft (60.3 m) long and 27 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 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 489 over Sunday Creek built?
It was built in 1961, making it 64 years old in 2025.
What condition is S 489 over Sunday Creek 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 November 2024.
How much traffic does S 489 over Sunday Creek carry?
About 607 vehicles per day (2023 count), of which roughly 1% are trucks.
How long is S 489 over Sunday Creek?
The structure is 198 ft (60.3 m) long with a longest span of 67 ft (20.4 m) and a deck 27 ft wide.
Who owns S 489 over Sunday Creek?
It is owned by the State Highway Agency.