State Route 78 over San Marcos Creek
GoodSan Diego County, California · 11-SD-078-12.42-SMCS · Structure no. 57 0514
- Built
- 1962
- 63 years old
- Condition
- Good
- inspected April 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 76 ft
- 5 main spans
- Daily traffic
- 152,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 78 over San Marcos Creek is a concrete continuous culvert carrying State Route 78 over San Marcos Creek in San Diego County, California. It was built in 1962, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 152,000 vehicles a day, roughly 5% of them trucks, projected to reach 163,650 by 2040. The structure is 76 ft (23.2 m) long. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 78 over San Marcos Creek built?
It was built in 1962, making it 63 years old in 2025.
What condition is State Route 78 over San Marcos Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2023.
How much traffic does State Route 78 over San Marcos Creek carry?
About 152,000 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is State Route 78 over San Marcos Creek?
The structure is 76 ft (23.2 m) long with a longest span of 10 ft (3 m).
Who owns State Route 78 over San Marcos Creek?
It is owned by the State Highway Agency.