RD 304 over South Fork Dill Slough
FairLassen County, California · 0.5 MI N/O RD 306 · Structure no. 07C0068
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 72 ft
- 4 main spans
- Daily traffic
- 100
- 1979 count
- Owner
- County
- County Highway Agency
About this bridge
RD 304 over South Fork Dill Slough is a wood or timber stringer/multi-beam or girder carrying RD 304 over South Fork Dill Slough in Lassen County, California. It was built in 1978, so it is 47 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 5 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 137 by 2041. The structure is 72 ft (21.9 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 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 | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was RD 304 over South Fork Dill Slough built?
It was built in 1978, making it 47 years old in 2025.
What condition is RD 304 over South Fork Dill 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 2024.
How much traffic does RD 304 over South Fork Dill Slough carry?
About 100 vehicles per day (1979 count), of which roughly 10% are trucks.
How long is RD 304 over South Fork Dill Slough?
The structure is 72 ft (21.9 m) long with a longest span of 18 ft (5.5 m) and a deck 24 ft wide.
Who owns RD 304 over South Fork Dill Slough?
It is owned by the County Highway Agency.