Alton Parkway over Interstate 5
FairOrange County, California · 12-ORA-005-22.21-IRVN · Structure no. 55 0629
- Built
- 1984
- 41 years old
- Condition
- Fair
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 280 ft
- 2 main spans
- Daily traffic
- 43,000
- 2017 count
- Owner
- State
- State Highway Agency
About this bridge
Alton Parkway over Interstate 5 is a prestressed concrete continuous box beam or girders - multiple carrying Alton Parkway over Interstate 5 in Orange County, California. It was built in 1984, so it is 41 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 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 43,000 vehicles a day, roughly 3% of them trucks, projected to reach 44,000 by 2041. The structure is 280 ft (85.3 m) long and 101 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 | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Alton Parkway over Interstate 5 built?
It was built in 1984, making it 41 years old in 2025.
What condition is Alton Parkway over Interstate 5 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 Alton Parkway over Interstate 5 carry?
About 43,000 vehicles per day (2017 count), of which roughly 3% are trucks.
How long is Alton Parkway over Interstate 5?
The structure is 280 ft (85.3 m) long with a longest span of 150 ft (45.7 m) and a deck 101 ft wide.
Who owns Alton Parkway over Interstate 5?
It is owned by the State Highway Agency.