RD 305 (mapes Rd) over Susan River Overflow #6
FairLassen County, California · 1.7 MI E/O RD 304 · Structure no. 07C0043
- Built
- 1978
- 47 years old
- Condition
- Fair
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 55 ft
- 3 main spans
- Daily traffic
- 100
- 1974 count
- Owner
- County
- County Highway Agency
About this bridge
RD 305 (mapes Rd) over Susan River Overflow #6 is a wood or timber stringer/multi-beam or girder carrying RD 305 (mapes Rd) over Susan River Overflow #6 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. Its operating status is: open, would be posted or closed except for temporary shoring.
It carries about 100 vehicles a day, roughly 8% of them trucks, projected to reach 165 by 2046. The structure is 55 ft (16.9 m) long and 24 ft wide. If it were closed, the detour would be 11.8 mi (19 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 305 (mapes Rd) over Susan River Overflow #6 built?
It was built in 1978, making it 47 years old in 2025.
What condition is RD 305 (mapes Rd) over Susan River Overflow #6 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 305 (mapes Rd) over Susan River Overflow #6 carry?
About 100 vehicles per day (1974 count), of which roughly 8% are trucks.
How long is RD 305 (mapes Rd) over Susan River Overflow #6?
The structure is 55 ft (16.9 m) long with a longest span of 19 ft (5.7 m) and a deck 24 ft wide.
Who owns RD 305 (mapes Rd) over Susan River Overflow #6?
It is owned by the County Highway Agency.