Interstate 605 SB over Interstate 405
FairOrange County, California · 12-ORA-605-3.48-SLB · Structure no. 55 0412L
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 317 ft
- 4 main spans
- Daily traffic
- 95,000
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 605 SB over Interstate 405 is a concrete continuous box beam or girders - multiple carrying Interstate 605 SB over Interstate 405 in Orange County, California. It was built in 1966, so it is 59 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 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 95,000 vehicles a day, roughly 5% of them trucks, projected to reach 106,253 by 2041. The structure is 317 ft (96.6 m) long and 72 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 605 SB over Interstate 405 built?
It was built in 1966, making it 59 years old in 2025.
What condition is Interstate 605 SB over Interstate 405 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 2024.
How much traffic does Interstate 605 SB over Interstate 405 carry?
About 95,000 vehicles per day (2015 count), of which roughly 5% are trucks.
How long is Interstate 605 SB over Interstate 405?
The structure is 317 ft (96.6 m) long with a longest span of 110 ft (33.5 m) and a deck 72 ft wide.
Who owns Interstate 605 SB over Interstate 405?
It is owned by the State Highway Agency.