Portola Parkway over Serrano Creek
FairOrange County, California · 0.3 Mi. Se/O Lake Forest · Structure no. 55C0597
- Built
- 1991
- 34 years old
- Condition
- Fair
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 92 ft
- 1 main span
- Daily traffic
- 35,000
- 2020 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Portola Parkway over Serrano Creek is a prestressed concrete box beam or girders - multiple carrying Portola Parkway over Serrano Creek in Orange County, California. It was built in 1991, so it is 34 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 35,000 vehicles a day, roughly 25% of them trucks, projected to reach 42,009 by 2041. The structure is 92 ft (28 m) long and 124 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Portola Parkway over Serrano Creek built?
It was built in 1991, making it 34 years old in 2025.
What condition is Portola Parkway over Serrano Creek 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 Portola Parkway over Serrano Creek carry?
About 35,000 vehicles per day (2020 count), of which roughly 25% are trucks.
How long is Portola Parkway over Serrano Creek?
The structure is 92 ft (28 m) long with a longest span of 89 ft (27.1 m) and a deck 124 ft wide.
Who owns Portola Parkway over Serrano Creek?
It is owned by the City or Municipal Highway Agency.