18th Street over Route 280
PoorSan Francisco County, California · 04-SF-280-R6.57-SF · Structure no. 34 0099
- Built
- 1968
- 57 years old
- Condition
- Poor
- inspected April 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 553 ft
- 9 main spans
- Daily traffic
- 7,000
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
18th Street over Route 280 is a concrete continuous box beam or girders - multiple carrying 18th Street over Route 280 in San Francisco County, California. It was built in 1968, so it is 57 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 7,000 vehicles a day, roughly 2% of them trucks, projected to reach 7,500 by 2045. The structure is 553 ft (168.5 m) long and 64 ft wide.
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, 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 Street over Route 280 built?
It was built in 1968, making it 57 years old in 2025.
What condition is 18th Street over Route 280 in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2024.
How much traffic does 18th Street over Route 280 carry?
About 7,000 vehicles per day (2018 count), of which roughly 2% are trucks.
How long is 18th Street over Route 280?
The structure is 553 ft (168.5 m) long with a longest span of 80 ft (24.3 m) and a deck 64 ft wide.
Who owns 18th Street over Route 280?
It is owned by the State Highway Agency.