Columbia River at Grand Coulee Dam (outflow), WA

OKANOGAN COUNTY, WA47.9567°N, -118.9805°W Updated 34 min ago

FLOW RATE

38,600cfs

Flow Rate Historical Avg

MEDIAN FLOW RATE · 1 DAY

38,600cfs

Optimal band: 36,550–49,450 cfs

PERIOD HIGH

80,900cfs

PERIOD LOW

32,600cfs

RUNNABLE

53%

last 1 day in band

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47.9567, -118.9805

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DATA · USACE · NOAA · NWSUPDATED 2026-09-22 22:00 UTC

Site #nwdp:GCL.Flow-Out.Ave.1Hour.1Hour.CBT-REV·USACE

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