S 363 over Alkali Creek
FairPhillips County, Montana · 4M SW Malta · Structure no. S00363008+08001
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 113 ft
- 2 main spans
- Daily traffic
- 121
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 363 over Alkali Creek is a prestressed concrete stringer/multi-beam or girder carrying S 363 over Alkali Creek in Phillips County, Montana. It was built in 1966, so it is 59 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 121 vehicles a day, roughly 2% of them trucks, projected to reach 127 by 2043. The structure is 113 ft (34.4 m) long and 33 ft wide. If it were closed, the detour would be 21.7 mi (35 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 363 over Alkali Creek built?
It was built in 1966, making it 59 years old in 2025.
What condition is S 363 over Alkali 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 March 2024.
How much traffic does S 363 over Alkali Creek carry?
About 121 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is S 363 over Alkali Creek?
The structure is 113 ft (34.4 m) long with a longest span of 55 ft (16.8 m) and a deck 33 ft wide.
Who owns S 363 over Alkali Creek?
It is owned by the State Highway Agency.