Strath Street over Left Hand Creek
FairBoulder County, Colorado · 0.2 MI N of Niwot RD · Structure no. BC-O-OSK-9A
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected February 2025
- Type
- Culvert
- Concrete
- Length
- 29 ft
- 2 main spans
- Daily traffic
- 92
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Strath Street over Left Hand Creek is a concrete culvert carrying Strath Street over Left Hand Creek in Boulder County, Colorado. It was built in 1970, so it is 55 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 92 vehicles a day, roughly 17% of them trucks, projected to reach 111 by 2043. The structure is 29 ft (8.8 m) long and 34 ft wide. If it were closed, the detour would be 98.8 mi (159 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 | 7 Good | Some minor problems. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Strath Street over Left Hand Creek built?
It was built in 1970, making it 55 years old in 2025.
What condition is Strath Street 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 February 2025.
How much traffic does Strath Street over Left Hand Creek carry?
About 92 vehicles per day (2023 count), of which roughly 17% are trucks.
How long is Strath Street over Left Hand Creek?
The structure is 29 ft (8.8 m) long with a longest span of 14 ft (4.3 m) and a deck 34 ft wide.
Who owns Strath Street over Left Hand Creek?
It is owned by the County Highway Agency.