State Route 166 over California Aqueduct
PoorKern County, California · 06-KER-166-17.44 · Structure no. 50 0323
- Built
- 1968
- 57 years old
- Condition
- Poor
- inspected April 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 394 ft
- 3 main spans
- Daily traffic
- 2,100
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 166 over California Aqueduct is a prestressed concrete continuous box beam or girders - multiple carrying State Route 166 over California Aqueduct in Kern County, California. It was built in 1968, so it is 57 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 2,100 vehicles a day, roughly 23% of them trucks, projected to reach 3,200 by 2042. The structure is 394 ft (120.1 m) long and 42 ft wide. If it were closed, the detour would be 13 mi (21 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 166 over California Aqueduct built?
It was built in 1968, making it 57 years old in 2025.
What condition is State Route 166 over California Aqueduct in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2024.
How much traffic does State Route 166 over California Aqueduct carry?
About 2,100 vehicles per day (2009 count), of which roughly 23% are trucks.
How long is State Route 166 over California Aqueduct?
The structure is 394 ft (120.1 m) long with a longest span of 160 ft (48.8 m) and a deck 42 ft wide.
Who owns State Route 166 over California Aqueduct?
It is owned by the State Highway Agency.