Forest Road 400 over Bunker Gulch
PoorMendocino County, California · E of JCT Road 440 · Structure no. 10F0037
- Built
- 1992
- 33 years old
- Condition
- Poor
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 32 ft
- 1 main span
- Daily traffic
- 10
- 2009 count
- Owner
- State
- State Park, Forest, or Reservation Agency
About this bridge
Forest Road 400 over Bunker Gulch is a steel stringer/multi-beam or girder carrying Forest Road 400 over Bunker Gulch in Mendocino County, California. It was built in 1992, so it is 33 years old, younger than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 10 vehicles a day, roughly 2% of them trucks, projected to reach 12 by 2041. The structure is 32 ft (9.8 m) long and 16 ft wide. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| 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 Forest Road 400 over Bunker Gulch built?
It was built in 1992, making it 33 years old in 2025.
What condition is Forest Road 400 over Bunker Gulch in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2023.
How much traffic does Forest Road 400 over Bunker Gulch carry?
About 10 vehicles per day (2009 count), of which roughly 2% are trucks.
How long is Forest Road 400 over Bunker Gulch?
The structure is 32 ft (9.8 m) long with a longest span of 30 ft (9.1 m) and a deck 16 ft wide.
Who owns Forest Road 400 over Bunker Gulch?
It is owned by the State Park, Forest, or Reservation Agency.