ROAD-1 South over Mcdonnell RD
FairSan Mateo County, California · East of SH 101 · Structure no. 35C0140R
- Built
- 1970
- 55 years old
- Condition
- Fair
- inspected January 2024
- Type
- Slab
- Prestressed Concrete Continuous
- Length
- 126 ft
- 4 main spans
- Daily traffic
- 33,710
- 2009 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
ROAD-1 South over Mcdonnell RD is a prestressed concrete continuous slab carrying ROAD-1 South over Mcdonnell RD in San Mateo County, California. It was built in 1970, so it is 55 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 33,710 vehicles a day, roughly 5% of them trucks, projected to reach 70,251 by 2042. The structure is 126 ft (38.4 m) long and 81 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was ROAD-1 South over Mcdonnell RD built?
It was built in 1970, making it 55 years old in 2025.
What condition is ROAD-1 South over Mcdonnell RD 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 Mcdonnell RD carry?
About 33,710 vehicles per day (2009 count), of which roughly 5% are trucks.
How long is ROAD-1 South over Mcdonnell RD?
The structure is 126 ft (38.4 m) long with a longest span of 48 ft (14.6 m) and a deck 81 ft wide.
Who owns ROAD-1 South over Mcdonnell RD?
It is owned by the City or Municipal Highway Agency.