US 287 over Madison River
FairGallatin County, Montana · 3M N West Yellowstone · Structure no. P00050003+07221
- Built
- 1968
- 57 years old
- Condition
- Fair
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 138 ft
- 3 main spans
- Daily traffic
- 4,098
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
US 287 over Madison River is a prestressed concrete stringer/multi-beam or girder carrying US 287 over Madison River in Gallatin 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 4,098 vehicles a day, roughly 6% of them trucks, projected to reach 4,303 by 2043. The structure is 138 ft (42.1 m) long and 43 ft wide. If it were closed, the detour would be 44.7 mi (72 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 287 over Madison River built?
It was built in 1968, making it 57 years old in 2025.
What condition is US 287 over Madison 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 Madison River carry?
About 4,098 vehicles per day (2023 count), of which roughly 6% are trucks.
How long is US 287 over Madison River?
The structure is 138 ft (42.1 m) long with a longest span of 45 ft (13.7 m) and a deck 43 ft wide.
Who owns US 287 over Madison River?
It is owned by the State Highway Agency.