Big Rock Ranch

Marin County, California (near Nicasio)

River/Stream: Nicasio Creek Trib To Lagunitas Creek

High Hazard

Failure would likely cause loss of life

Key Facts

Dam Type
Earth
Height
45 ft
Dam Length
490 ft
Reservoir Storage
91 acre-ft
Year Completed
2002
Primary Purpose
Water Supply
Owner Type
Private
Max Discharge
—

Condition Assessment

SatisfactoryLast inspected: 2023-12-14

Hazard Classification: High — This describes the potential consequences of dam failure, not the likelihood of failure.

Condition Assessment: Satisfactory — This describes the current physical condition of the dam based on the most recent inspection.

Location

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Quick Stats

NID ID
CA01457
State
California (CA)
Coordinates
38.05060, -122.62770
Age
24 years

Nearby Dams

External Resources

Data sourced from the National Inventory of Dams (NID). Information may not reflect the most current status of this dam. Hazard classification reflects potential consequences of failure, not the likelihood of failure or the current condition.