Johnstonville RD over Sand Slough
FairLassen County, California · 0.2 MI N of US 395 · Structure no. 07C0029
- Built
- 1922
- 103 years old
- Condition
- Fair
- inspected August 2023
- Type
- Culvert
- Concrete Continuous
- Length
- 23 ft
- 2 main spans
- Daily traffic
- 200
- 1980 count
- Owner
- County
- County Highway Agency
About this bridge
Johnstonville RD over Sand Slough is a concrete continuous culvert carrying Johnstonville RD over Sand Slough in Lassen County, California. It was built in 1922, so it is 103 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 200 vehicles a day, roughly 7% of them trucks, projected to reach 326 by 2041. The structure is 23 ft (7 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Johnstonville RD over Sand Slough built?
It was built in 1922, making it 103 years old in 2025.
What condition is Johnstonville RD over Sand Slough 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 August 2023.
How much traffic does Johnstonville RD over Sand Slough carry?
About 200 vehicles per day (1980 count), of which roughly 7% are trucks.
How long is Johnstonville RD over Sand Slough?
The structure is 23 ft (7 m) long with a longest span of 10 ft (3 m) and a deck 26 ft wide.
Who owns Johnstonville RD over Sand Slough?
It is owned by the County Highway Agency.