Historical Data

The National Weather Service (NWS), NOAA, is a source of data provided in some of these products.

Historical Monthly Snow Course and SNOTEL Data

• Snow Course and SNOTEL Snow Water Data Tables - Period of Record - Individual Sites
       (Report Generator and Text Format Tables)
• Idaho and All Western States Monthly Basin Analysis Snowpack Reports  (Includes snow courses & SNOTEL sites, format types: BASN, BASS, LOST)

Historical Monthly Precipitation Basin Reports

• Idaho and All Western States Monthly Basin Analysis Precipitation Reports  (Includes SNOTEL sites, format types: BAPR, BSPR)

Historic Monthly Precipitation Tables

• Idaho Data Collection Office Area SNOTEL sites (Idaho, western Wyoming, northern Nevada, eastern Washington) - Period of Record Monthly Precipitation:

SNOTEL Site
Select SNOTEL SiteAtlanta Summit,IDBanner Summit,IDBase Camp,WYBear Basin,IDBear Canyon,IDBear Creek,NVBear Mountain,IDBear Saddle,IDBig Creek Summit,IDBig Sandy Opening,WYBlind Bull Sum,WYBogus Basin,IDBostetter R.S.,IDBrundage Reservoir,IDBunchgrass Mdw,WACamas Creek Divide,IDChocolate Gulch,IDCool Creek,IDCottonwood Creek,WYCozy Cove,IDCrab Creek,IDCrater Meadows,IDDeadwood Summit,IDDollarhide Summit,IDEast Rim Divide,WYElk Butte,IDElkhart Park G.S.,WYEmigrant Summit,IDGalena Summit,IDGalena,IDGarfield R.S.,IDGiveout,IDGraham Guard Sta.,IDGrand Targhee,WYGranite Creek,WYGrassy Lake,WYGros Ventre Summit,WYGunsight Pass,WYHams Fork,WYHemlock Butte,IDHidden Lake,IDHilts Creek,IDHowell Canyon,IDHumboldt Gulch,IDHyndman,IDIndian Creek,WYIsland Park,IDJackson Peak,IDKelley R.S.,WYKendall R.S.,WYLarsen Creek,WYLewis Lake Divide,WYLolo Pass,IDLong Valley,IDLookout,IDLoomis Park,WYLost Lake,IDLost-Wood Divide,IDMagic Mountain,IDMeadow Lake,IDMica Creek,IDMill Creek Summit,IDMoonshine,IDMoose Creek,IDMores Creek Summit,IDMorgan Creek,IDMoscow Mountain,IDMosquito Ridge,IDMountain Meadows,IDMud Flat,IDMyrtle Creek,IDNew Fork Lake,WYOrchard Range Site (SCAN),IDOxford Spring,IDPhillips Bench,WYPierce R.S.,IDPine Creek Pass,IDPocket Creek,WYPole Creek R.S.,NVPrairie,IDQuartz Peak,WARagged Mountain,IDSalt River Summit,WYSavage Pass,IDSchwartz Lake,IDSchweitzer Basin,IDSecesh Summit,IDSedgwick Peak,IDShanghi Summit,IDSheep Mtn.,IDSherwin,IDSlug Creek Divide,IDSmiley Mountain,IDSnake River Station,WYSnider Basin,WYSoldier R.S.,IDSomsen Ranch,IDSourdough Gulch,WASouth Mtn.,IDSpring Creek Divide,WYSpruce Springs,WASquaw Flat,IDStickney Mill,IDSunset,IDSwede Peak,IDThumb Divide,WYTogwotee Pass,WYTouchet,WATrinity Mtn.,IDTriple Peak,WYTwo Ocean Plateau,WYVan Wyck,IDVienna Mine,IDWest Branch,IDWhite Elephant,IDWildhorse Divide,IDWillow Creek,WYWilson Creek,ID

 

• Idaho NWS and COOP sites - Period of Record Monthly Precipitation:

ACIS/COOP Site
Select ACIS/COOP SiteAberdeen Experimnt StnAmerican Falls 1 SWAnderson DamArco 3 SWArrowrock DamAshtonBernBlackfoot 2 SSWBoise WSFO AirportBonners FerryBrownlee DamBruneauBurley FAA APCabinet GorgeCambridgeCascade 1 NWCenterville Arbaugh RanChilly Barton FlatCoeur D Alene 1 ECouncilCraters Of The Moon NMDixieDriggsDubois Experiment StnDworshak Fish HatcheryElk City Ranger StnEmmett 2 EFairfield R SFenn Ranger StnFort Hall Indian AgencyGarden Valley R SGlenns FerryGraceGrangevilleHamer 4 NWHeadquartersHollisterHoweIdaho CityIdaho Falls 16 SEIdaho Falls 2 ESEIdaho Falls 46 WIsland ParkKamiahKelloggKetchum Ranger StnKooskia 5 SSELewiston WSO APLifton Pumping StnMackay Ranger StnMalta 2 EMccallMiddle Fork LodgeMinidoka DamMoscow Univ Of IdahoMountain HomeMullanNew Meadows Ranger StnNezperceOakleyOLaPaul 1 ENEPayettePicaboPiercePocatello WSO ArptPorthillPotlatch 3 NNEPowellPrestonPriest River Exp StnReynoldsRichfieldRigginsSaint MariesSalmon KsraSandpoint Expermnt StnShoshone 1 WNWSilver City 5 WSoda Springs AirportSt Anthony 1 WNWStanleySwan Falls Power HouseSwan Valley 2 ETetonia Experiment StnTwin Falls WSOWarrenWeiser 2 SEYellow Pine 7 S

 

Historic Monthly Reservoir End of Month Storage Tables

• IDAHO and Nearby Reservoirs - ALL sites, all years, takes a few minutes to load.
• Reservoir Capacity Definitions and Streamflow Adjustments for Reservoirs and Forecast Points Listed in Idaho Basin Outlook Reports


• Select Individual Reservoir Historic Data

RESERVOIR
Select ReservoirAmerican Falls ReservoirAnderson Ranch ReservoirArrowrock ReservoirBear LakeBlackfoot ReservoirBrownlee ReservoirCascade ReservoirDeadwood ReservoirDworshak ReservoirGrassy LakeHenrys LakeIsland Park ReservoirJackson LakeLake Coeur d' AleneLake OwyheeLake Pend OreilleLittle Wood ReservoirLucky Peak ReservoirMackay ReservoirMagic ReservoirMann Creek ReservoirMontpelier ReservoirOakley ReservoirPalisades ReservoirPriest LakeRirie ReservoirSalmon Falls ReservoirWild Horse Reservoir

 

Historical Monthly Adjusted Streamflow Tables

Data in these tables for streams with major reservoirs have been adjusted by adding upstream reservoir change-in-storage volumes and major diversions to the observed monthly streamflow volumes to reflect a "natural flow" condition.  Reservoir evaporation and most diversions are not accounted for in the NRCS database listed here.  The U.S. Geological Survey (USGS),  U.S. Bureau of Reclamation (USBR) and Idaho Department of Water Resources (IDWR) are a source of most of the data presented.  Streams without reservoirs and stations upstream of the reservoirs show monthly data as received directly from USGS archived records.

Idaho Data Collection Office Area Streamflow Sites
Select Streamflow Site Bear R bl Stewart DamBig Lost R at Howell RanchBig Lost R bl Mackay ReservoirBig Sandy R nr FarsonBig Wood R ab Magic ReservoirBig Wood R at HaileyBig Wood R at Stanton XingBig Wood R bl Magic DamBlackfoot R ab Reservoir nr HenryBoise R nr BoiseBoise R nr Twin SpringsBoundary Ck nr PorthillBruneau R nr Hot SpringBuffalo Fk ab Lava Ck nr MoranCamas Ck at CamasCamas Ck nr BlaineClearwater R at OrofinoClearwater R at SpaldingClearwater River Near PeckDeadwood Reservoir InflowDingle Inlet Canal nr Dingle IDDischarge Crosscut Canal To Teton RiverDiv Fm Snake R Bet Shelly And BlackfootDiv To North And South Canals Fr OwyheeDiv. Fm Snake R Bet Heise And Shelly GageDworshak Reservoir InflowFalls R nr AshtonFalls River ab Yellowstone CanalFalls River Near SquirrelGoose Ck abv Trapper Ck nr OakleyGreen R at Fontenelle DamGreen R at Warren BridgeGreen R nr Green RiverGreen R nr La BargeGreys R ab Reservoir nr AlpineGros Ventre R at KellyHams Fk bl Pole Ck nr FrontierHams Fk bl Viva Naughton ReservoirHenrys Fk nr AshtonHenrys Fk nr RexburgJohnson Ck at Yellow PineLake Fork Payette R nr MccallLemhi R nr LemhiLittle Lost R nr HoweLittle Lost River Near HoweLittle Salmon River at RigginsLittle Wood R ab High Five CkLittle Wood R nr CareyLochsa R nr LowellMarsh Creek Near MccammonMf Salmon R at Mf LodgeMores Ck nr Arrowrock DamMoyie R at EastportN Fk Big Lost R at Wild Horse nr ChillyNew Fork R nr Big PineyNF Coeur D'Alene R nr PrichardNF Coeur dAlene R at EnavilleNF Payette R at CascadeNF Payette R nr BanksNF Payette River at MccallNorth Fork Clearwater R nr Canyon RsOakley Reservoir InflowOwyhee R bl Owyhee DamOwyhee R nr Gold CkOwyhee R nr OwyheeOwyhee R nr RomePacific Ck at MoranPalouse River Near PotlatchPayette R nr Horseshoe BendPine Creek ab Fremont LakePortneuf R at TopazPortneuf River at PocatelloPriest R nr Priest RiverRainbow Inlet Canal nr DingleReynolds Ck at TollgateSalmon Falls Ck nr San JacintoSalmon R at SalmonSalmon R at White BirdSalmon R. Canal Co. Canal nr RogersonSalt R ab Reservoir nr EtnaSelway R nr LowellSF Boise R at Anderson Ranch DamSF Owyhee R nr WhiterockSF Payette R at LowmanSF Salmon R nr Krassel Ranger StationSmith Ck nr PorthillSnake R ab Reservoir nr AlpineSnake R at Flagg RanchSnake R at King HillSnake R at NeeleySnake R at WeiserSnake R nr BlackfootSnake R nr HeiseSnake R nr IrwinSnake R nr MoranSnake R nr MurphySnake R nr ShelleySnake River at Blackfoot IDSouth Fork Boise R nr FeathervilleSouth Fork Clearwater River at StitesSpokane R nr Post FallsSt. Joe R at CalderSt. Maries River Near SantaSum Major Divs Falls Riv Ashton-ChesterSum Of Divs Falls River ab Ashton GageSum Of Major Divs Ashton To St AnthonySum Of Major Divs St Anthony To RexburgSum Pump Divs Teton Rivs Leigh Ck-St ATeton R nr DriggsTeton R nr St AnthonyTrapper Ck nr OakleyWeiser R nr WeiserWeiser River Near CambridgeWillow Ck nr RirieWillow Creek nr Bellevue  

• IDAHO Active Streamflow Stations - all sites, all years, takes a few minutes to load.
• WYOMING Active Streamflow Stations - all sites, all years, takes a few minutes to load.
• NEVADA Active Streamflow Stations - all sites, all years, takes a few minutes to load.