Johnston

San Mateo County, California

River/Stream: Arroyo Leon

Low Hazard

Failure would cause minimal damage

Key Facts

Dam Type
Gravity
Height
31 ft
Dam Length
132 ft
Reservoir Storage
30 acre-ft
Year Completed
1919
Primary Purpose
Water Supply
Owner Type
Private
Max Discharge
—

Condition Assessment

SatisfactoryLast inspected: 2024-06-03

Hazard Classification: Low — 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
CA00667
State
California (CA)
Coordinates
37.45410, -122.42390
Age
107 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.