US 550 Ml over Animas River
FairLa Plata County, Colorado · In Durango · Structure no. O-05-J
- Built
- 1910
- 115 years old, rebuilt 1965
- Condition
- Fair
- inspected October 2023
- Type
- Arch - Deck
- Concrete
- Length
- 151 ft
- 3 main spans
- Daily traffic
- 28,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
US 550 Ml over Animas River is a concrete arch - deck carrying US 550 Ml over Animas River in La Plata County, Colorado. It was built in 1910 and reconstructed in 1965, so it is 115 years old, older than the Colorado average of 42.2 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 28,000 vehicles a day, roughly 4% of them trucks, projected to reach 29,120 by 2040. The structure is 151 ft (46 m) long and 80 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 US 550 Ml over Animas River built?
It was built in 1910, making it 115 years old in 2025. It was reconstructed in 1965.
What condition is US 550 Ml over Animas 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 550 Ml over Animas River carry?
About 28,000 vehicles per day (2020 count), of which roughly 4% are trucks.
How long is US 550 Ml over Animas River?
The structure is 151 ft (46 m) long with a longest span of 40 ft (12.2 m) and a deck 80 ft wide.
Who owns US 550 Ml over Animas River?
It is owned by the State Highway Agency.