Gregory LN over Grayson Creek
GoodContra Costa County, California · 0.4 MI W Contra Costa Bl · Structure no. 28C0348
- Built
- 1959
- 66 years old
- Condition
- Good
- inspected February 2023
- Type
- Culvert
- Concrete
- Length
- 20 ft
- 1 main span
- Daily traffic
- 10,000
- 2020 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Gregory LN over Grayson Creek is a concrete culvert carrying Gregory LN over Grayson Creek in Contra Costa County, California. It was built in 1959, so it is 66 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 10,000 vehicles a day, roughly 5% of them trucks, projected to reach 25,584 by 2045. The structure is 20 ft (6.2 m) long and 73 ft wide. If it were closed, the detour would be 1.9 mi (3 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 |
|---|---|---|
| Channel and channel protection | 8 Very Good | No problems noted. |
| Culvert | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Gregory LN over Grayson Creek built?
It was built in 1959, making it 66 years old in 2025.
What condition is Gregory LN over Grayson 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 February 2023.
How much traffic does Gregory LN over Grayson Creek carry?
About 10,000 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is Gregory LN over Grayson Creek?
The structure is 20 ft (6.2 m) long with a longest span of 20 ft (6.2 m) and a deck 73 ft wide.
Who owns Gregory LN over Grayson Creek?
It is owned by the City or Municipal Highway Agency.