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

• 2007 Water Year (Provisional data) Monthly Precipitation Totals for SNOTEL and NWS Stations (Inches)
  Idaho | Montana | Nevada | Oregon | Utah | Washington | Wyoming

• 2006 Water Year (Provisional data) Monthly Precipitation Totals for SNOTEL and NWS Stations (Inches)
  Idaho | Montana | Nevada | Oregon | Utah | Washington | Wyoming

• 2005 Water Year (Provisional data) Monthly Precipitation Totals for SNOTEL and NWS Stations (Inches)
  Idaho | Montana | Nevada | Oregon | Utah | Washington | Wyoming

• 2004 and 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

• 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.