State Route 84 over San Gregorio Creek
GoodSan Mateo County, California · 04-SM-084-7.55 · Structure no. 35 0166
- Built
- 1957
- 68 years old
- Condition
- Good
- inspected May 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 102 ft
- 3 main spans
- Daily traffic
- 1,400
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 84 over San Gregorio Creek is a concrete continuous tee beam carrying State Route 84 over San Gregorio Creek in San Mateo County, California. It was built in 1957, so it is 68 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 1,400 vehicles a day, roughly 4% of them trucks, projected to reach 2,619 by 2046. The structure is 102 ft (31.1 m) long and 34 ft wide. If it were closed, the detour would be 18 mi (29 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 84 over San Gregorio Creek built?
It was built in 1957, making it 68 years old in 2025.
What condition is State Route 84 over San Gregorio Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.
How much traffic does State Route 84 over San Gregorio Creek carry?
About 1,400 vehicles per day (2009 count), of which roughly 4% are trucks.
How long is State Route 84 over San Gregorio Creek?
The structure is 102 ft (31.1 m) long with a longest span of 40 ft (12.2 m) and a deck 34 ft wide.
Who owns State Route 84 over San Gregorio Creek?
It is owned by the State Highway Agency.