Imhoff Road over Grayson Creek
FairContra Costa County, California · 0.8 MI W Solano Way · Structure no. 28C0113
- Built
- 1981
- 44 years old
- Condition
- Fair
- inspected September 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 199 ft
- 4 main spans
- Daily traffic
- 1,000
- 2014 count
- Owner
- County
- County Highway Agency
About this bridge
Imhoff Road over Grayson Creek is a concrete continuous box beam or girders - multiple carrying Imhoff Road over Grayson Creek in Contra Costa County, California. It was built in 1981, so it is 44 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 1,000 vehicles a day, roughly 5% of them trucks, projected to reach 3,227 by 2044. The structure is 199 ft (60.7 m) long and 53 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Imhoff Road over Grayson Creek built?
It was built in 1981, making it 44 years old in 2025.
What condition is Imhoff Road over Grayson Creek 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 September 2024.
How much traffic does Imhoff Road over Grayson Creek carry?
About 1,000 vehicles per day (2014 count), of which roughly 5% are trucks.
How long is Imhoff Road over Grayson Creek?
The structure is 199 ft (60.7 m) long with a longest span of 57 ft (17.4 m) and a deck 53 ft wide.
Who owns Imhoff Road over Grayson Creek?
It is owned by the County Highway Agency.