US 36 Ml over Four Mile Canyon Creek
FairBoulder County, Colorado · 28th ST in Boulder · Structure no. D-15-B
- Built
- 1957
- 68 years old, rebuilt 2016
- Condition
- Fair
- inspected August 2023
- Type
- Tee Beam
- Concrete
- Length
- 93 ft
- 3 main spans
- Daily traffic
- 16,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
US 36 Ml over Four Mile Canyon Creek is a concrete tee beam carrying US 36 Ml over Four Mile Canyon Creek in Boulder County, Colorado. It was built in 1957 and reconstructed in 2016, so it is 68 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 16,000 vehicles a day, roughly 2% of them trucks, projected to reach 18,240 by 2040. The structure is 93 ft (28.3 m) long and 43 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 36 Ml over Four Mile Canyon Creek built?
It was built in 1957, making it 68 years old in 2025. It was reconstructed in 2016.
What condition is US 36 Ml over Four Mile Canyon 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 36 Ml over Four Mile Canyon Creek carry?
About 16,000 vehicles per day (2020 count), of which roughly 2% are trucks.
How long is US 36 Ml over Four Mile Canyon Creek?
The structure is 93 ft (28.3 m) long with a longest span of 30 ft (9.1 m) and a deck 43 ft wide.
Who owns US 36 Ml over Four Mile Canyon Creek?
It is owned by the State Highway Agency.