Interstate 405 over 120th Street
GoodLos Angeles County, California · 07-LA-405-R20.73-ESEG · Structure no. 53 1240
- Built
- 1963
- 62 years old, rebuilt 1989
- Condition
- Good
- inspected November 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 147 ft
- 3 main spans
- Daily traffic
- 261,000
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 405 over 120th Street is a concrete continuous box beam or girders - multiple carrying Interstate 405 over 120th Street in Los Angeles County, California. It was built in 1963 and reconstructed in 1989, 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 261,000 vehicles a day, roughly 5% of them trucks, projected to reach 309,957 by 2041. The structure is 147 ft (44.8 m) long and 172 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 405 over 120th Street built?
It was built in 1963, making it 62 years old in 2025. It was reconstructed in 1989.
What condition is Interstate 405 over 120th 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 November 2024.
How much traffic does Interstate 405 over 120th Street carry?
About 261,000 vehicles per day (2022 count), of which roughly 5% are trucks.
How long is Interstate 405 over 120th Street?
The structure is 147 ft (44.8 m) long with a longest span of 85 ft (25.9 m) and a deck 172 ft wide.
Who owns Interstate 405 over 120th Street?
It is owned by the State Highway Agency.