US 550 Ml over Dsng RR
FairLa Plata County, Colorado · 4 MI N of Hermosa · Structure no. O-05-AW
- Built
- 1977
- 48 years old
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 142 ft
- 3 main spans
- Daily traffic
- 3,200
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
US 550 Ml over Dsng RR is a steel continuous stringer/multi-beam or girder carrying US 550 Ml over Dsng RR in La Plata County, Colorado. It was built in 1977, so it is 48 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 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 3,200 vehicles a day, roughly 6% of them trucks, projected to reach 3,392 by 2040. The structure is 142 ft (43.4 m) long and 54 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 550 Ml over Dsng RR built?
It was built in 1977, making it 48 years old in 2025.
What condition is US 550 Ml over Dsng RR 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 2023.
How much traffic does US 550 Ml over Dsng RR carry?
About 3,200 vehicles per day (2020 count), of which roughly 6% are trucks.
How long is US 550 Ml over Dsng RR?
The structure is 142 ft (43.4 m) long with a longest span of 58 ft (17.7 m) and a deck 54 ft wide.
Who owns US 550 Ml over Dsng RR?
It is owned by the State Highway Agency.