Interstate 405 over Main Street
FairLos Angeles County, California · 07-LA-405-12.60-CRSN · Structure no. 53 1135
- Built
- 1961
- 64 years old, rebuilt 1999
- Condition
- Fair
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Concrete
- Length
- 121 ft
- 1 main span
- Daily traffic
- 265,000
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 405 over Main Street is a concrete box beam or girders - multiple carrying Interstate 405 over Main Street in Los Angeles County, California. It was built in 1961 and reconstructed in 1999, so it is 64 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 265,000 vehicles a day, roughly 5% of them trucks, projected to reach 304,730 by 2046. The structure is 121 ft (36.9 m) long and 175 ft wide. If it were closed, the detour would be 1.9 mi (3 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 405 over Main Street built?
It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1999.
What condition is Interstate 405 over Main Street 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 405 over Main Street carry?
About 265,000 vehicles per day (2019 count), of which roughly 5% are trucks.
How long is Interstate 405 over Main Street?
The structure is 121 ft (36.9 m) long with a longest span of 114 ft (34.7 m) and a deck 175 ft wide.
Who owns Interstate 405 over Main Street?
It is owned by the State Highway Agency.