Road M1 over Eel River
PoorLake County, California · 13 Miles NE Potter Valley · Structure no. 050854000001001
- Built
- 1971
- 54 years old
- Condition
- Poor
- inspected August 2023
- Type
- Box Beam or Girders - Multiple
- Concrete
- Length
- 303 ft
- 1 main span
- Daily traffic
- 350
- 1992 count
- Owner
- Federal
- U.S. Forest Service
About this bridge
Road M1 over Eel River is a concrete box beam or girders - multiple carrying Road M1 over Eel River in Lake County, California. It was built in 1971, so it is 54 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 3 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 350 vehicles a day, roughly 3% of them trucks, projected to reach 525 by 2045. The structure is 303 ft (92.3 m) long and 32 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| 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 Road M1 over Eel River built?
It was built in 1971, making it 54 years old in 2025.
What condition is Road M1 over Eel River 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 August 2023.
How much traffic does Road M1 over Eel River carry?
About 350 vehicles per day (1992 count), of which roughly 3% are trucks.
How long is Road M1 over Eel River?
The structure is 303 ft (92.3 m) long with a longest span of 120 ft (36.6 m) and a deck 32 ft wide.
Who owns Road M1 over Eel River?
It is owned by the U.S. Forest Service.