Forest Road 800 over North Fork Big River
FairMendocino County, California · 0.1 Mile South of SR 20 · Structure no. 10F0017
- Built
- 1958
- 67 years old
- Condition
- Fair
- inspected May 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 38 ft
- 1 main span
- Daily traffic
- 50
- 2009 count
- Owner
- State
- State Park, Forest, or Reservation Agency
About this bridge
Forest Road 800 over North Fork Big River is a prestressed concrete box beam or girders - multiple carrying Forest Road 800 over North Fork Big River in Mendocino County, California. It was built in 1958, so it is 67 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 50 vehicles a day, roughly 2% of them trucks, projected to reach 62 by 2041. The structure is 38 ft (11.5 m) long and 16 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Forest Road 800 over North Fork Big River built?
It was built in 1958, making it 67 years old in 2025.
What condition is Forest Road 800 over North Fork Big 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 800 over North Fork Big River carry?
About 50 vehicles per day (2009 count), of which roughly 2% are trucks.
How long is Forest Road 800 over North Fork Big River?
The structure is 38 ft (11.5 m) long with a longest span of 36 ft (11 m) and a deck 16 ft wide.
Who owns Forest Road 800 over North Fork Big River?
It is owned by the State Park, Forest, or Reservation Agency.