State Route 1 over Aliso Creek
FairOrange County, California · 12-ORA-001-6.49-LGNB · Structure no. 55 0003
- Built
- 1926
- 99 years old, rebuilt 1932
- Condition
- Fair
- inspected June 2023
- Type
- Stringer/Multi-beam or Girder
- Concrete
- Length
- 130 ft
- 4 main spans
- Daily traffic
- 36,000
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 1 over Aliso Creek is a concrete stringer/multi-beam or girder carrying State Route 1 over Aliso Creek in Orange County, California. It was built in 1926 and reconstructed in 1932, so it is 99 years old, older 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 5 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 36,000 vehicles a day, roughly 2% of them trucks, projected to reach 46,100 by 2040. The structure is 130 ft (39.6 m) long and 72 ft wide. If it were closed, the detour would be 11.2 mi (18 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 1 over Aliso Creek built?
It was built in 1926, making it 99 years old in 2025. It was reconstructed in 1932.
What condition is State Route 1 over Aliso 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 June 2023.
How much traffic does State Route 1 over Aliso Creek carry?
About 36,000 vehicles per day (2014 count), of which roughly 2% are trucks.
How long is State Route 1 over Aliso Creek?
The structure is 130 ft (39.6 m) long with a longest span of 35 ft (10.7 m) and a deck 72 ft wide.
Who owns State Route 1 over Aliso Creek?
It is owned by the State Highway Agency.