State Route 78 over San Marcos Blvd
FairSan Diego County, California · 11-SD-078-12.13-SMCS · Structure no. 57 0387
- Built
- 1994
- 31 years old, rebuilt 2000
- Condition
- Fair
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 240 ft
- 2 main spans
- Daily traffic
- 156,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 78 over San Marcos Blvd is a prestressed concrete stringer/multi-beam or girder carrying State Route 78 over San Marcos Blvd in San Diego County, California. It was built in 1994 and reconstructed in 2000, so it is 31 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 156,000 vehicles a day, roughly 5% of them trucks, projected to reach 218,607 by 2040. The structure is 240 ft (73.2 m) long and 131 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 | 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 78 over San Marcos Blvd built?
It was built in 1994, making it 31 years old in 2025. It was reconstructed in 2000.
What condition is State Route 78 over San Marcos Blvd 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 April 2023.
How much traffic does State Route 78 over San Marcos Blvd carry?
About 156,000 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is State Route 78 over San Marcos Blvd?
The structure is 240 ft (73.2 m) long with a longest span of 128 ft (39 m) and a deck 131 ft wide.
Who owns State Route 78 over San Marcos Blvd?
It is owned by the State Highway Agency.