ROAD-1 South over East Undercrossing
FairSan Mateo County, California · East of US 101 · Structure no. 35C0131
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected January 2024
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 40 ft
- 1 main span
- Daily traffic
- 64,200
- 2010 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
ROAD-1 South over East Undercrossing is a prestressed concrete tee beam carrying ROAD-1 South over East Undercrossing in San Mateo County, California. It was built in 1973, so it is 52 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 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 64,200 vehicles a day, roughly 2% of them trucks, projected to reach 10,011 by 2042. The structure is 40 ft (12.2 m) long and 221 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was ROAD-1 South over East Undercrossing built?
It was built in 1973, making it 52 years old in 2025.
What condition is ROAD-1 South over East Undercrossing 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 ROAD-1 South over East Undercrossing carry?
About 64,200 vehicles per day (2010 count), of which roughly 2% are trucks.
How long is ROAD-1 South over East Undercrossing?
The structure is 40 ft (12.2 m) long with a longest span of 36 ft (11 m) and a deck 221 ft wide.
Who owns ROAD-1 South over East Undercrossing?
It is owned by the City or Municipal Highway Agency.