Forest Road 320 over South Fork Noyo River
FairMendocino County, California · Parlin Fork Conservation · Structure no. 10F0011
- Built
- 1948
- 77 years old
- Condition
- Fair
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Wood or Timber
- Length
- 64 ft
- 2 main spans
- Daily traffic
- 125
- 2009 count
- Owner
- State
- State Park, Forest, or Reservation Agency
About this bridge
Forest Road 320 over South Fork Noyo River is a wood or timber stringer/multi-beam or girder carrying Forest Road 320 over South Fork Noyo River in Mendocino County, California. It was built in 1948, so it is 77 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 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 125 vehicles a day, roughly 2% of them trucks, projected to reach 162 by 2041. The structure is 64 ft (19.5 m) long and 13 ft wide. If it were closed, the detour would be 11.2 mi (18 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 Forest Road 320 over South Fork Noyo River built?
It was built in 1948, making it 77 years old in 2025.
What condition is Forest Road 320 over South Fork Noyo 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 May 2023.
How much traffic does Forest Road 320 over South Fork Noyo River carry?
About 125 vehicles per day (2009 count), of which roughly 2% are trucks.
How long is Forest Road 320 over South Fork Noyo River?
The structure is 64 ft (19.5 m) long with a longest span of 30 ft (9.1 m) and a deck 13 ft wide.
Who owns Forest Road 320 over South Fork Noyo River?
It is owned by the State Park, Forest, or Reservation Agency.