Interstate 5 NB over 18th Street
GoodSan Diego County, California · 11-SD-005-R10.43-NATC · Structure no. 57 0252R
- Built
- 1951
- 74 years old, rebuilt 1965
- Condition
- Good
- inspected April 2023
- Type
- Slab
- Concrete Continuous
- Length
- 103 ft
- 3 main spans
- Daily traffic
- 82,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 5 NB over 18th Street is a concrete continuous slab carrying Interstate 5 NB over 18th Street in San Diego County, California. It was built in 1951 and reconstructed in 1965, so it is 74 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 82,000 vehicles a day, roughly 5% of them trucks, projected to reach 117,466 by 2040. The structure is 103 ft (31.4 m) long and 100 ft wide. 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 |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| 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 Interstate 5 NB over 18th Street built?
It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1965.
What condition is Interstate 5 NB over 18th Street 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 Interstate 5 NB over 18th Street carry?
About 82,000 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is Interstate 5 NB over 18th Street?
The structure is 103 ft (31.4 m) long with a longest span of 40 ft (12.2 m) and a deck 100 ft wide.
Who owns Interstate 5 NB over 18th Street?
It is owned by the State Highway Agency.