Historic Data

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

Summary Reports

• Past SNOTEL Snow and Precipitation Update Reports  (Daily summaries created using edited SNOTEL data)
• Past NRCS Weekly Snowpack/Drought Monitor Update Reports

Daily SNOTEL Data

• Water Year Table  (All sites, one water year, standard sensors)
• Tab-Delimited Format  (Individual site, one water year, standard sensors)
• Precipitation Data Table  (Individual site, period of record)
• Snow Water Data Table  (Individual site, period of record)
• Air Temperature Data Table  (Individual site, period of record)

• 1st of Month Snow Water Data File - All Sites  (Large file, all Idaho snow courses & SNOTEL sites, snow water & snow depth data)
All Western States
• 1st of Month Snow Water Data File - Individual Sites  (Idaho snow courses & SNOTEL sites, snow water & snow depth data)
All Western States
• Idaho Snowpack Reports  (Includes snow courses & SNOTEL sites, format types: BASN, BASS, LOST)
• Idaho Precipitation Reports  (Includes SNOTEL sites, format types: BAPR, BSPR)
• All Western States Monthly Basin Analysis Reports
  Precipitation
  Snowpack
• Annual Data Summary - All Western States  (Archived 1st of month and mid-month SNOTEL and snow course data since 1986)

• 2009 Water Year (Provisional data) Monthly Precipitation Totals for SNOTEL and NWS Stations (Inches)
  Idaho | Montana | Nevada | Oregon | Utah | Washington | Wyoming

• 2008 Water Year (Provisional data) Monthly Precipitation Totals for SNOTEL and NWS Stations (Inches)
  Idaho | Montana | Nevada | Oregon | Utah | Washington | Wyoming

• Prior Water Years Monthly Precipitation Totals for SNOTEL and NWS Stations (Inches)
  View individual sites from the list of all stations above, archived data.

• IDAHO text File Of All Reservoirs
• Wyoming text File Of All Reservoirs
• Reservoir Capacity Definitions for Reservoirs Listed in Idaho Basin Outlook Reports

Data in these tables for streams with major reservoirs have been adjusted by adding upstream reservoir change-in-storage volumes 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 text File Of Streamflow Stations
• Wyoming text File Of Streamflow Stations
• Nevada text File Of Streamflow Stations
• Oregon text File Of Streamflow Stations

• Panhandle Region Basins
• Clearwater River Basin
• Salmon River Basin
• Weiser, Payette, Boise Basins
• Wood and Lost River Basins
• Upper Snake River Basin
• Southside Snake River Basins
• Bear River Basin

Snow Graphs - Illustrating the Chance of Snowpack to Recover by April 1.  These snow graphs are sorted from low to high, first of month SWE for January, February, and March with comparisons to how the winter accumulation season ended on April 1.  The graphs are based on the historic snow index data listed above.

• Idaho First of Month Snowpack Maps
  • 2009 Snowpack Maps
  • 2008 Snowpack Maps
  • 2007 Snowpack Maps
  • 2006 Snowpack Maps
  • 2005 Snowpack Maps
  • 2004 Snowpack Maps
  • 2003 Snowpack Maps
  • 2002 Snowpack Maps
  • 2001 Snowpack Maps
  • 2000 Snowpack Maps

• Idaho First of Month Streamflow Forecast Maps
  • 2009 Stream Forecast Maps
  • 2008 Stream Forecast Maps
  • 2007 Stream Forecast Maps
  • 2006 Stream Forecast Maps
  • 2005 Stream Forecast Maps
  • 2004 Stream Forecast Maps
  • 2003 Stream Forecast Maps
  • 2002 Stream Forecast Maps
  • 2001 Stream Forecast Maps
  • 2000 Stream Forecast Maps

Last Modified: 11/13/2009