Route 101N Onramp over Alemany Cir Uc (nbd O-R)
FairSan Francisco County, California · 04-SF-101-2.20-SF · Structure no. 34 0063S
- Built
- 1950
- 75 years old
- Condition
- Fair
- inspected January 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 331 ft
- 6 main spans
- Daily traffic
- 6,000
- 2018 count
- Owner
- State
- State Highway Agency
About this bridge
Route 101N Onramp over Alemany Cir Uc (nbd O-R) is a steel stringer/multi-beam or girder carrying Route 101N Onramp over Alemany Cir Uc (nbd O-R) in San Francisco County, California. It was built in 1950, so it is 75 years old, older 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 6 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 6,000 vehicles a day, roughly 3% of them trucks, projected to reach 10,091 by 2046. The structure is 331 ft (100.9 m) long and 31 ft wide.
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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Route 101N Onramp over Alemany Cir Uc (nbd O-R) built?
It was built in 1950, making it 75 years old in 2025.
What condition is Route 101N Onramp over Alemany Cir Uc (nbd O-R) 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 January 2024.
How much traffic does Route 101N Onramp over Alemany Cir Uc (nbd O-R) carry?
About 6,000 vehicles per day (2018 count), of which roughly 3% are trucks.
How long is Route 101N Onramp over Alemany Cir Uc (nbd O-R)?
The structure is 331 ft (100.9 m) long with a longest span of 73 ft (22.3 m) and a deck 31 ft wide.
Who owns Route 101N Onramp over Alemany Cir Uc (nbd O-R)?
It is owned by the State Highway Agency.