Twin Oak Valley RD over State Route 78
FairSan Diego County, California · 11-SD-078-12.91-ESD · Structure no. 57 1033
- Built
- 1999
- 26 years old
- Condition
- Fair
- inspected May 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 224 ft
- 2 main spans
- Daily traffic
- 16,231
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
Twin Oak Valley RD over State Route 78 is a concrete continuous box beam or girders - multiple carrying Twin Oak Valley RD over State Route 78 in San Diego County, California. It was built in 1999, so it is 26 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 16,231 vehicles a day, roughly 1% of them trucks, projected to reach 31,022 by 2040. The structure is 224 ft (68.3 m) long and 125 ft wide. If it were closed, the detour would be 0.6 mi (1 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 Twin Oak Valley RD over State Route 78 built?
It was built in 1999, making it 26 years old in 2025.
What condition is Twin Oak Valley RD over State Route 78 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 May 2023.
How much traffic does Twin Oak Valley RD over State Route 78 carry?
About 16,231 vehicles per day (2014 count), of which roughly 1% are trucks.
How long is Twin Oak Valley RD over State Route 78?
The structure is 224 ft (68.3 m) long with a longest span of 124 ft (37.8 m) and a deck 125 ft wide.
Who owns Twin Oak Valley RD over State Route 78?
It is owned by the State Highway Agency.