State Route 166 over Red Rock Canyon Creek
FairSan Luis Obispo County, California · 05-SLO-166-46.84 · Structure no. 49 0233
- Built
- 1993
- 32 years old
- Condition
- Fair
- inspected May 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 21 ft
- 2 main spans
- Daily traffic
- 2,900
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 166 over Red Rock Canyon Creek is a concrete continuous culvert carrying State Route 166 over Red Rock Canyon Creek in San Luis Obispo County, California. It was built in 1993, so it is 32 years old, younger than the California average of 54.8 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 2,900 vehicles a day, projected to reach 8,737 by 2042. The structure is 21 ft (6.3 m) long and 59 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 |
|---|---|---|
| Channel and channel protection | 9 Excellent | No problems noted. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 166 over Red Rock Canyon Creek built?
It was built in 1993, making it 32 years old in 2025.
What condition is State Route 166 over Red Rock 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 May 2024.
How much traffic does State Route 166 over Red Rock Canyon Creek carry?
About 2,900 vehicles per day (2009 count).
How long is State Route 166 over Red Rock Canyon Creek?
The structure is 21 ft (6.3 m) long with a longest span of 10 ft (3.1 m) and a deck 59 ft wide.
Who owns State Route 166 over Red Rock Canyon Creek?
It is owned by the State Highway Agency.