State Route 55 over Santiago Creek
FairOrange County, California · 12-ORA-055-13.42-ORA · Structure no. 55 0033
- Built
- 1962
- 63 years old, rebuilt 2002
- Condition
- Fair
- inspected March 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 366 ft
- 5 main spans
- Daily traffic
- 248,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 55 over Santiago Creek is a concrete continuous box beam or girders - multiple carrying State Route 55 over Santiago Creek in Orange County, California. It was built in 1962 and reconstructed in 2002, so it is 63 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 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 248,000 vehicles a day, roughly 6% of them trucks, projected to reach 285,000 by 2042. The structure is 366 ft (111.7 m) long and 204 ft wide. If it were closed, the detour would be 2.5 mi (4 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 55 over Santiago Creek built?
It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2002.
What condition is State Route 55 over Santiago 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 March 2024.
How much traffic does State Route 55 over Santiago Creek carry?
About 248,000 vehicles per day (2020 count), of which roughly 6% are trucks.
How long is State Route 55 over Santiago Creek?
The structure is 366 ft (111.7 m) long with a longest span of 85 ft (25.8 m) and a deck 204 ft wide.
Who owns State Route 55 over Santiago Creek?
It is owned by the State Highway Agency.