Harvard Avenue over Interstate 405
FairOrange County, California · 12-ORA-405-6.20-IRVN · Structure no. 55 0630
- Built
- 1983
- 42 years old
- Condition
- Fair
- inspected January 2025
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 286 ft
- 2 main spans
- Daily traffic
- 10,000
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
Harvard Avenue over Interstate 405 is a prestressed concrete continuous box beam or girders - multiple carrying Harvard Avenue over Interstate 405 in Orange County, California. It was built in 1983, so it is 42 years old, younger 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 5 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 10,000 vehicles a day, roughly 3% of them trucks, projected to reach 12,075 by 2045. The structure is 286 ft (87.2 m) long and 68 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 | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Harvard Avenue over Interstate 405 built?
It was built in 1983, making it 42 years old in 2025.
What condition is Harvard Avenue 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 January 2025.
How much traffic does Harvard Avenue over Interstate 405 carry?
About 10,000 vehicles per day (2015 count), of which roughly 3% are trucks.
How long is Harvard Avenue over Interstate 405?
The structure is 286 ft (87.2 m) long with a longest span of 160 ft (48.8 m) and a deck 68 ft wide.
Who owns Harvard Avenue over Interstate 405?
It is owned by the State Highway Agency.