Columbia River at Grand Coulee Dam (outflow), WA

OKANOGAN COUNTY, WA47.9567°N, -118.9805°W Updated 22 hr ago

FLOW RATE

50,057cfs

Flow Rate Historical Avg

MEDIAN FLOW RATE · 30 DAY

50,057cfs

Optimal band: 42,639–57,687 cfs

PERIOD HIGH

103,400cfs

PERIOD LOW

33,367cfs

RUNNABLE

52%

last 30 day in band

Weather Map

Loading weather map…

Your History · Columbia River at Grand Coulee Dam (outflow), WA

Track your history

Sign in to track your sessions at Columbia River at Grand Coulee Dam (outflow), WA: best days, monthly trends, and time on the water.

47.9567, -118.9805

Loading map…

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

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

Create a free account to save favorites, set flow alerts, and track conditions