US 287 Ml over Left Hand Creek
FairBoulder County, Colorado · In Longmont · Structure no. D-16-C
- Built
- 1948
- 77 years old, rebuilt 1970
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 43 ft
- 1 main span
- Daily traffic
- 24,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
US 287 Ml over Left Hand Creek is a steel stringer/multi-beam or girder carrying US 287 Ml over Left Hand Creek in Boulder County, Colorado. It was built in 1948 and reconstructed in 1970, so it is 77 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 24,000 vehicles a day, roughly 4% of them trucks, projected to reach 30,480 by 2040. The structure is 43 ft (13.1 m) long and 91 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| 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 287 Ml over Left Hand Creek built?
It was built in 1948, making it 77 years old in 2025. It was reconstructed in 1970.
What condition is US 287 Ml over Left Hand Creek 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 August 2023.
How much traffic does US 287 Ml over Left Hand Creek carry?
About 24,000 vehicles per day (2020 count), of which roughly 4% are trucks.
How long is US 287 Ml over Left Hand Creek?
The structure is 43 ft (13.1 m) long with a longest span of 39 ft (11.9 m) and a deck 91 ft wide.
Who owns US 287 Ml over Left Hand Creek?
It is owned by the State Highway Agency.