Flagstaff RD CR56 over Hillside Slide
GoodBoulder County, Colorado · 1.0 MI W of Baseline RD · Structure no. BC-56-00.9-SS
- Built
- 1996
- 29 years old
- Condition
- Good
- inspected January 2025
- Type
- Slab
- Concrete Continuous
- Length
- 170 ft
- 6 main spans
- Daily traffic
- 2,463
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Flagstaff RD CR56 over Hillside Slide is a concrete continuous slab carrying Flagstaff RD CR56 over Hillside Slide in Boulder County, Colorado. It was built in 1996, so it is 29 years old, younger than the Colorado average of 42.2 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 2,463 vehicles a day, roughly 2% of them trucks, projected to reach 2,956 by 2043. The structure is 170 ft (51.8 m) long and 23 ft wide. If it were closed, the detour would be 24.9 mi (40 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Flagstaff RD CR56 over Hillside Slide built?
It was built in 1996, making it 29 years old in 2025.
What condition is Flagstaff RD CR56 over Hillside Slide in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.
How much traffic does Flagstaff RD CR56 over Hillside Slide carry?
About 2,463 vehicles per day (2023 count), of which roughly 2% are trucks.
How long is Flagstaff RD CR56 over Hillside Slide?
The structure is 170 ft (51.8 m) long with a longest span of 30 ft (9.1 m) and a deck 23 ft wide.
Who owns Flagstaff RD CR56 over Hillside Slide?
It is owned by the County Highway Agency.