State Route 166 over Alamo Creek
GoodSan Luis Obispo County, California · 05-SLO-166-17.73 · Structure no. 49 0179
- Built
- 1959
- 66 years old
- Condition
- Good
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 466 ft
- 4 main spans
- Daily traffic
- 2,600
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 166 over Alamo Creek is a steel stringer/multi-beam or girder carrying State Route 166 over Alamo Creek in San Luis Obispo County, California. It was built in 1959, so it is 66 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 2,600 vehicles a day, roughly 24% of them trucks, projected to reach 9,121 by 2042. The structure is 466 ft (141.9 m) long and 33 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 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 Alamo Creek built?
It was built in 1959, making it 66 years old in 2025.
What condition is State Route 166 over Alamo Creek 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 May 2024.
How much traffic does State Route 166 over Alamo Creek carry?
About 2,600 vehicles per day (2009 count), of which roughly 24% are trucks.
How long is State Route 166 over Alamo Creek?
The structure is 466 ft (141.9 m) long with a longest span of 115 ft (35.1 m) and a deck 33 ft wide.
Who owns State Route 166 over Alamo Creek?
It is owned by the State Highway Agency.