Interstate 405 over Route 39
FairOrange County, California · 12-ORA-405-16.52-HNTB · Structure no. 55 0267
- Built
- 1965
- 60 years old, rebuilt 1989
- Condition
- Fair
- inspected September 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 268 ft
- 4 main spans
- Daily traffic
- 256,000
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 405 over Route 39 is a concrete continuous box beam or girders - multiple carrying Interstate 405 over Route 39 in Orange County, California. It was built in 1965 and reconstructed in 1989, so it is 60 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 256,000 vehicles a day, roughly 4% of them trucks, projected to reach 343,000 by 2040. The structure is 268 ft (81.7 m) long and 234 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 405 over Route 39 built?
It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1989.
What condition is Interstate 405 over Route 39 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 September 2023.
How much traffic does Interstate 405 over Route 39 carry?
About 256,000 vehicles per day (2014 count), of which roughly 4% are trucks.
How long is Interstate 405 over Route 39?
The structure is 268 ft (81.7 m) long with a longest span of 94 ft (28.7 m) and a deck 234 ft wide.
Who owns Interstate 405 over Route 39?
It is owned by the State Highway Agency.