US 287 over Jefferson River
FairJefferson County, Montana · 10M SW Three Forks · Structure no. P00013083+00441
- Built
- 2001
- 24 years old
- Condition
- Fair
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 347 ft
- 3 main spans
- Daily traffic
- 1,227
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 287 over Jefferson River is a prestressed concrete stringer/multi-beam or girder carrying US 287 over Jefferson River in Jefferson County, Montana. It was built in 2001, so it is 24 years old, younger 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 1,227 vehicles a day, roughly 13% of them trucks, projected to reach 1,288 by 2043. The structure is 347 ft (105.9 m) long and 42 ft wide. If it were closed, the detour would be 52.2 mi (84 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 US 287 over Jefferson River built?
It was built in 2001, making it 24 years old in 2025.
What condition is US 287 over Jefferson River 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 October 2023.
How much traffic does US 287 over Jefferson River carry?
About 1,227 vehicles per day (2023 count), of which roughly 13% are trucks.
How long is US 287 over Jefferson River?
The structure is 347 ft (105.9 m) long with a longest span of 110 ft (33.6 m) and a deck 42 ft wide.
Who owns US 287 over Jefferson River?
It is owned by the State Highway Agency.