S 359 over Jefferson River Slough
FairJefferson County, Montana · Cardwell · Structure no. S00359001+03461
- Built
- 1968
- 57 years old
- Condition
- Fair
- inspected March 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 112 ft
- 2 main spans
- Daily traffic
- 1,362
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
S 359 over Jefferson River Slough is a prestressed concrete stringer/multi-beam or girder carrying S 359 over Jefferson River Slough in Jefferson County, Montana. It was built in 1968, so it is 57 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 1,362 vehicles a day, roughly 5% of them trucks, projected to reach 1,505 by 2043. The structure is 112 ft (34 m) long and 37 ft wide. If it were closed, the detour would be 36 mi (58 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was S 359 over Jefferson River Slough built?
It was built in 1968, making it 57 years old in 2025.
What condition is S 359 over Jefferson River Slough 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 359 over Jefferson River Slough carry?
About 1,362 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is S 359 over Jefferson River Slough?
The structure is 112 ft (34 m) long with a longest span of 55 ft (16.8 m) and a deck 37 ft wide.
Who owns S 359 over Jefferson River Slough?
It is owned by the State Highway Agency.