N405-S55 Conn Ramp over I 405 & S405-N55 Conn
GoodOrange County, California · 12-ORA-405-8.85-CMS · Structure no. 55 0422G
- Built
- 1968
- 57 years old
- Condition
- Good
- inspected February 2025
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 600 ft
- 7 main spans
- Daily traffic
- 25,000
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
N405-S55 Conn Ramp over I 405 & S405-N55 Conn is a concrete continuous box beam or girders - multiple carrying N405-S55 Conn Ramp over I 405 & S405-N55 Conn in Orange 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 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 25,000 vehicles a day, roughly 5% of them trucks, projected to reach 30,186 by 2045. The structure is 600 ft (182.9 m) long and 34 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was N405-S55 Conn Ramp over I 405 & S405-N55 Conn built?
It was built in 1968, making it 57 years old in 2025.
What condition is N405-S55 Conn Ramp over I 405 & S405-N55 Conn 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 February 2025.
How much traffic does N405-S55 Conn Ramp over I 405 & S405-N55 Conn carry?
About 25,000 vehicles per day (2014 count), of which roughly 5% are trucks.
How long is N405-S55 Conn Ramp over I 405 & S405-N55 Conn?
The structure is 600 ft (182.9 m) long with a longest span of 112 ft (34.1 m) and a deck 34 ft wide.
Who owns N405-S55 Conn Ramp over I 405 & S405-N55 Conn?
It is owned by the State Highway Agency.