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GCDW1 Data Hydrograph GCDW1 Gage Info Conditions Map Photos Gage Information Rating Table Water Forecasts: 0 - 14 Days 14 - 120 Days Water Supply Peak Flow AHPS Watch & Warnings Flood Outlook Discussion Past Floods River Photos Hydrologic Cycle Return Main Menu | COLUMBIA--GRAND COULEE DAM (GCDW1) County: GRANT      State: WA Elevation: 1700 (feet)      Latitude: 47 58' 0"    Longitude: 118 58' 59"
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