Milligan Canyon RD over Int Milligan-I 90 004
FairJefferson County, Montana · 11M W Cardwell · Structure no. L22858000+01001
- Built
- 1969
- 56 years old
- Condition
- Fair
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 307 ft
- 4 main spans
- Daily traffic
- 100
- 2025 count
- Owner
- State
- State Highway Agency
About this bridge
Milligan Canyon RD over Int Milligan-I 90 004 is a steel continuous stringer/multi-beam or girder carrying Milligan Canyon RD over Int Milligan-I 90 004 in Jefferson County, Montana. It was built in 1969, so it is 56 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 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 307 ft (93.7 m) long and 34 ft wide. If it were closed, the detour would be 24.9 mi (40 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Milligan Canyon RD over Int Milligan-I 90 004 built?
It was built in 1969, making it 56 years old in 2025.
What condition is Milligan Canyon RD over Int Milligan-I 90 004 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 May 2024.
How much traffic does Milligan Canyon RD over Int Milligan-I 90 004 carry?
About 100 vehicles per day (2025 count), of which roughly 3% are trucks.
How long is Milligan Canyon RD over Int Milligan-I 90 004?
The structure is 307 ft (93.7 m) long with a longest span of 95 ft (29 m) and a deck 34 ft wide.
Who owns Milligan Canyon RD over Int Milligan-I 90 004?
It is owned by the State Highway Agency.