US 287 Ml over Big Thompson River
FairLarimer County, Colorado · 0.4 MI N of JCT SH 402 · Structure no. C-16-H
- Built
- 1950
- 75 years old, rebuilt 1975
- Condition
- Fair
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 103 ft
- 3 main spans
- Daily traffic
- 18,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
US 287 Ml over Big Thompson River is a steel continuous stringer/multi-beam or girder carrying US 287 Ml over Big Thompson River in Larimer County, Colorado. It was built in 1950 and reconstructed in 1975, so it is 75 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 18,000 vehicles a day, roughly 5% of them trucks, projected to reach 21,960 by 2040. The structure is 103 ft (31.5 m) long and 100 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Big Thompson River built?
It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1975.
What condition is US 287 Ml over Big Thompson 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 September 2023.
How much traffic does US 287 Ml over Big Thompson River carry?
About 18,000 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is US 287 Ml over Big Thompson River?
The structure is 103 ft (31.5 m) long with a longest span of 38 ft (11.6 m) and a deck 100 ft wide.
Who owns US 287 Ml over Big Thompson River?
It is owned by the State Highway Agency.