Interstate 380 WB over US 101 Ramps City ST
FairSan Mateo County, California · 04-SM-380-6.33-SBR · Structure no. 35 0255L
- Built
- 1976
- 49 years old, rebuilt 1987
- Condition
- Fair
- inspected February 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 2,018 ft
- 6 main spans
- Daily traffic
- 75,000
- 1998 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 380 WB over US 101 Ramps City ST is a prestressed concrete continuous box beam or girders - multiple carrying Interstate 380 WB over US 101 Ramps City ST in San Mateo County, California. It was built in 1976 and reconstructed in 1987, so it is 49 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 75,000 vehicles a day, roughly 5% of them trucks, projected to reach 127,922 by 2042. The structure is 2,018 ft (615.1 m) long and 45 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 380 WB over US 101 Ramps City ST built?
It was built in 1976, making it 49 years old in 2025. It was reconstructed in 1987.
What condition is Interstate 380 WB over US 101 Ramps City ST 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 February 2024.
How much traffic does Interstate 380 WB over US 101 Ramps City ST carry?
About 75,000 vehicles per day (1998 count), of which roughly 5% are trucks.
How long is Interstate 380 WB over US 101 Ramps City ST?
The structure is 2,018 ft (615.1 m) long with a longest span of 141 ft (43 m) and a deck 45 ft wide.
Who owns Interstate 380 WB over US 101 Ramps City ST?
It is owned by the State Highway Agency.