Grand Coulee Dam

Okanogan County, Washington (near COULEE DAM CITY)

River/Stream: COLUMBIA RIVER

High Hazard

Failure would likely cause loss of life

Key Facts

Dam Type
Concrete
Height
550 ft
Dam Length
5,375 ft
Reservoir Storage
9,715,346 acre-ft
Year Completed
1941
Primary Purpose
Flood Risk Reduction
Owner Type
Federal
Max Discharge
265,000 cfs

Condition Assessment

Not AvailableLast inspected: 2021-09-17

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

Condition Assessment: Not Available — This describes the current physical condition of the dam based on the most recent inspection.

Location

Loading map...

Quick Stats

NID ID
WA00262
State
Washington (WA)
Coordinates
47.95660, -118.98050
Age
85 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.