Columbia Basin Water Supply

PTAGIS System Outages 4/17 - 4/20: "Due to a PSMFC-wide infrastructure migration, the PTAGIS systems (website, reporting, data submission) will be inaccessible for periods of time between 4/17 and 4/20." DART will load PTAGIS data as it is made available. Thank you for your patience.

Data Courtesy of Northwest River Forecast Center, NOAA

The DART Columbia Basin "Water Supply" Summary (updated monthly) presents current monthly water supply with historical and 30 year normal at select sites in the Columbia Basin: Columbia River at International Boundary, Priest Rapids, Dworshak, Lower Granite, The Dalles, and Bonneville. Based on April-September rankings at each site, the wettest and driest 5 years are highlighted. For complete coverage, please visit Water Supply Forecasts, Northwest River Forecast Center, NOAA.

Upper Columbia Basin

Water Supply Boundary Current, Historical, 5 Wettest Years, 5 Driest Years, 30 Year Normal

Water Supply Priest Rapids Current, Historical, 5 Wettest Years, 5 Driest Years, 30 Year Normal

Snake Basin

Water Supply Dworshak Current, Historical, 5 Wettest Years, 5 Driest Years, 30 Year Normal

Water Supply Lower Granite Current, Historical, 5 Wettest Years, 5 Driest Years, 30 Year Normal

Mainstem Columbia

Water Supply The Dalles Current, Historical, 5 Wettest Years, 5 Driest Years, 30 Year Normal

Water Supply Bonneville Current, Historical, 5 Wettest Years, 5 Driest Years, 30 Year Normal

Last Update: April 02 2025 09:03:02.