RD 315 over Susan River
FairLassen County, California · 0.6 MI S of CR 215 · Structure no. 07C0006
- Built
- 1987
- 38 years old
- Condition
- Fair
- inspected August 2024
- Type
- Slab
- Concrete Continuous
- Length
- 121 ft
- 4 main spans
- Daily traffic
- 100
- 1986 count
- Owner
- County
- County Highway Agency
About this bridge
RD 315 over Susan River is a concrete continuous slab carrying RD 315 over Susan River in Lassen County, California. It was built in 1987, so it is 38 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 194 by 2046. The structure is 121 ft (37 m) long and 33 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was RD 315 over Susan River built?
It was built in 1987, making it 38 years old in 2025.
What condition is RD 315 over Susan River 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 2024.
How much traffic does RD 315 over Susan River carry?
About 100 vehicles per day (1986 count), of which roughly 10% are trucks.
How long is RD 315 over Susan River?
The structure is 121 ft (37 m) long with a longest span of 30 ft (9.1 m) and a deck 33 ft wide.
Who owns RD 315 over Susan River?
It is owned by the County Highway Agency.