Interstate 405 over Lassen Street
GoodLos Angeles County, California · 07-LA-405-45.74-LA · Structure no. 53 1498
- Built
- 1963
- 62 years old, rebuilt 1977
- Condition
- Good
- inspected October 2023
- Type
- Box Beam or Girders - Multiple
- Concrete
- Length
- 149 ft
- 1 main span
- Daily traffic
- 216,000
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 405 over Lassen Street is a concrete box beam or girders - multiple carrying Interstate 405 over Lassen Street in Los Angeles County, California. It was built in 1963 and reconstructed in 1977, so it is 62 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 216,000 vehicles a day, roughly 10% of them trucks, projected to reach 295,723 by 2040. The structure is 149 ft (45.4 m) long and 164 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 Interstate 405 over Lassen Street built?
It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1977.
What condition is Interstate 405 over Lassen Street 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 October 2023.
How much traffic does Interstate 405 over Lassen Street carry?
About 216,000 vehicles per day (2019 count), of which roughly 10% are trucks.
How long is Interstate 405 over Lassen Street?
The structure is 149 ft (45.4 m) long with a longest span of 90 ft (27.4 m) and a deck 164 ft wide.
Who owns Interstate 405 over Lassen Street?
It is owned by the State Highway Agency.