18th ST over Interstate 805
FairSan Diego County, California · 11-SD-805-9.99-NATC · Structure no. 57 0641
- Built
- 1974
- 51 years old
- Condition
- Fair
- inspected June 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 272 ft
- 2 main spans
- Daily traffic
- 15,700
- 2022 count
- Owner
- State
- State Highway Agency
About this bridge
18th ST over Interstate 805 is a prestressed concrete continuous box beam or girders - multiple carrying 18th ST over Interstate 805 in San Diego County, California. It was built in 1974, so it is 51 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 15,700 vehicles a day, roughly 1% of them trucks, projected to reach 18,485 by 2044. The structure is 272 ft (82.9 m) long and 52 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 18th ST over Interstate 805 built?
It was built in 1974, making it 51 years old in 2025.
What condition is 18th ST over Interstate 805 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 June 2024.
How much traffic does 18th ST over Interstate 805 carry?
About 15,700 vehicles per day (2022 count), of which roughly 1% are trucks.
How long is 18th ST over Interstate 805?
The structure is 272 ft (82.9 m) long with a longest span of 149 ft (45.4 m) and a deck 52 ft wide.
Who owns 18th ST over Interstate 805?
It is owned by the State Highway Agency.