Rock Island

Douglas County, Washington (near Vantage, WA)

River/Stream: Columbia River

High Hazard

Failure would likely cause loss of life

Key Facts

Dam Type
Gravity
Height
71 ft
Dam Length
3,108 ft
Reservoir Storage
131,000 acre-ft
Year Completed
1932
Primary Purpose
Hydroelectric
Owner Type
Public Utility
Max Discharge
920,000 cfs

Condition Assessment

SatisfactoryLast inspected: 2022-06-15

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
WA00084
State
Washington (WA)
Coordinates
47.34236, -120.09432
Age
94 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.