Alpine Street over Oligarchy Ditch
FairBoulder County, Colorado · 100 Ft N of E 9th Ave · Structure no. LONG-ALP-E9TH
- Built
- 1975
- 50 years old
- Condition
- Fair
- inspected January 2025
- Type
- Culvert
- Concrete
- Length
- 20 ft
- 2 main spans
- Daily traffic
- 3,757
- 2023 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Alpine Street over Oligarchy Ditch is a concrete culvert carrying Alpine Street over Oligarchy Ditch in Boulder County, Colorado. It was built in 1975, so it is 50 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 3,757 vehicles a day, roughly 9% of them trucks, projected to reach 4,509 by 2042. The structure is 20 ft (6.2 m) long and 64 ft wide. If it were closed, the detour would be 1.2 mi (2 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 |
|---|---|---|
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Alpine Street over Oligarchy Ditch built?
It was built in 1975, making it 50 years old in 2025.
What condition is Alpine Street over Oligarchy Ditch 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 January 2025.
How much traffic does Alpine Street over Oligarchy Ditch carry?
About 3,757 vehicles per day (2023 count), of which roughly 9% are trucks.
How long is Alpine Street over Oligarchy Ditch?
The structure is 20 ft (6.2 m) long with a longest span of 9 ft (2.7 m) and a deck 64 ft wide.
Who owns Alpine Street over Oligarchy Ditch?
It is owned by the City or Municipal Highway Agency.