Official Government Website

Water Supply Data Sources

The technical data sources listed below are used by the Water Supply Committee to prepare the comprehensive water supply outlook.

TopicLinkDescriptionSource
WeatherIdaho Annual Average PrecipitationGraphical map of Idaho’s annual average precipitationIDWR
DroughtDrought Declarations Issued by IDWRIdaho counties with Drought Emergency Declaration ordersIDWR
RiversRiver Flows for RecreationistsFlow in cubic feet per second (cfs) for rivers of local interestUSGS, USBR, Idaho Power
SnowSnow Water Equivalency



Weekly maps showing snowpack measurement in Idaho


IDWR
Reservoir StorageBear River “Teacup” DiagramsReservoir levels and average daily streamflowsBRC
WeatherWarnings and Watches: Southwest IdahoClimate predictions for southwest IdahoNOAA
SnowSnow Cover Information (by location)Graphic snow parameter for the Western United States and the Columbia BasinNWS, NOAA
WeatherWarnings and Watches: Central IdahoClimate predictions for central IdahoNOAA
WeatherWarnings and Watches: Northern IdahoClimate predictions for northern IdahoNOAA
WeatherWarnings and Watches: Southeast IdahoClimate predictions for southeast IdahoNOAA
WeatherNational 10-Day Precipitation OutlookGraphical precipitation forecastIGES
WeatherNational 10-Day Temperature OutlookGraphical temperature forecastIGES
WeatherNorthwest Weather Radar ImageCurrent weather radar imageNOAA, NWS
RiversRiver Flow Information (by river)Real-time streamflow dataUSGS
Reservoir StorageMackay Reservoir LevelsData for the Mackay Reservoir near Mackay, IdahoUSGS
SnowSnowpack Basin IndexBased on mountain data from NRCS SNOTEL sitesNRCS
WeatherWestern Regional Climate CenterClimate data and predictions for the western United StatesWRCC
WeatherEl Niño and La Niña: Frequently Asked QuestionsCommonly asked questions and their answers regarding El Niño and La NiñaWRCC
WeatherNational Long Range Precipitation & Temperature OutlookOne year outlooks in 90-day intervalsWRCC
SnowWestern US SNOTEL InformationNarrative and mapped SNOTEL climate informationWRCC
WeatherIdaho Climate SummariesInteractive map of climate dataWRCC
RiversColorado Basin River Forecast CenterRiver conditions in the Colorado BasinNOAA
WeatherClimate Prediction CenterClimate predictions for the United StatesNOAA
WeatherEl Niño and La Niña: Basic Facts & BackgroundAdvisories and predictions for El Niño and La Niña conditionsNOAA
DroughtPalmer Drought IndexColor-coded drought severity map of the United StatesNOAA
DroughtDrought Assessment InformationWeekly United States drought assessment from the Climate Prediction CenterNOAA
SnowNational Snow InformationDaily snow depth and snow fall information from the Climate Prediction CenterNOAA
RiversRiver Flow Information (by river)Real-time streamflow dataIdaho Power
SnowSatellite Snow Cover Maps (by month)Satellite areal extent of snow coverNRCS, NWCC, NOAA
SnowBasin Comparison GraphsLinks to time series plots of current water year basin snowpack and precipitation compared to other yearsNRCS
SnowBasin Projection GraphsLinks to time series plots of current water year basin snowpack and precipitation with non-exceedance for the remainder of the water yearNRCS
RiversDaily Guidance Streamflow ForecastsDaily forecasts using SNOTEL dataNRCS
RiversPeak Streamflow for Individual BasinsSnow-Stream comparison graphs to monitor peak streamflowsNRCS
SnowIdaho Snow SurveyMountain snowpack data and streamflow forecasts for the western United StatesNRCS
SnowSNOTEL Interactive Map – Snow Water Equivalent (Station/Basin Conditions)Interactive map showing daily station/basin snowpack measurement in Idaho


NRCS
Reservoir StoragePacific Northwest System InformationReservoir Data is under Report List on this page from USCEUSCE
RiversNorthwest River Forecast CenterRiver and hydrology 10-day and 120-day forecast pointsNOAA
WeatherIdaho Evapotranspiration ChartsCrop water use chartsUSBR
Reservoir StorageBoise and Payette River SystemsReservoir levels and average daily streamflowsUSBR
Reservoir StorageUpper Snake River SystemReservoir levels and average daily streamflowsUSBR
Reservoir StorageRiver Basin ReportsNear real-time Pacific Northwest water and environmental dataUSBR
RiversSurface Water DataCurrent and average streamflow and lake level dataUSGS
SnowWest-wide Snowpack MapMonthly mountain snowpack mapsNRCS
RiversWestern U.S. Streamflow Forecast MapMonthly streamflow forecastsNRCS
SnowSnow Water Equivalent % of NormalWeekly maps showing snowpack measurement in IdahoNRCS
SnowSNOTEL Interactive Map – Snow Water Equivalent (Station Conditions)Interactive map showing daily station snowpack measurement in IdahoNRCS
WeatherIdaho Weather ForecastsDetailed weather forecasts for IdahoNOAA
WeatherPrecipitation ForecastsQuantitative precipitation forecasts for the United StatesNOAA
WeatherNorthwest Precipitation OutlookPrecipitation forecast updated every six hoursTWC/Intellicast
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