Union Main

Alpine County, California (near Dorrington)

River/Stream: North Fork Stanislaus River -

Low Hazard

Failure would cause minimal damage

Key Facts

Dam Type
Rockfill
Height
36 ft
Dam Length
1,142 ft
Reservoir Storage
3,283 acre-ft
Year Completed
1910
Primary Purpose
Hydroelectric
Owner Type
Private
Max Discharge
18,000 cfs

Condition Assessment

SatisfactoryLast inspected: 2022-08-10

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
CA00426
State
California (CA)
Coordinates
38.43050, -119.99770
Age
116 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.