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Idaho Snow Survey Homepage

Idaho Snow Survey and Water Supply Forecasting Program

The Idaho NRCS Snow Survey Program provides mountain snowpack and precipitation information via SNOpack TELemetry (SNOTEL) network in order to issue streamflow forecasts for Idaho. Common applications of snow survey products include water supply management, flood control, climate modeling, recreation, and conservation planning.

**Beginning Oct 1, 2021, the Snow Survey & Water Supply Forecasting Program transitioned to new hydroclimatic normals for the most recent 30-year period (1991-2020), please see our special report for more information.**

The June 1, 2023 Water Supply Report is coming soon!




Idaho Snowpack and Water Supply Outlook Report:

If you'd like to subscribe to the monthly distribution list, please click here.

Click here (or on image to left) to view the most recent report issued at the beginning of each month. (January 1 - June 1).  

Monthly Forecast Tables

Graphical Forecast Tables

Past Water Supply Outlook Reports


Product Highlights

Interactive Idaho map

Interactive Idaho Map

You can now gain access to a variety of data types:


Daily SNOTEL Graphics

Basin-Wide Products

  • Snow Water Equivalent
  • Precipitation
  • Average Daily Temperature

Individual SNOTEL Site Products

  • Snow Water Equivalent (Current)
  • Precipitation (Water Year to Date)
  • Average Daily Temperature (Current)
  • Soil Moisture (Where available)
Real-Time Condition Maps

Real-Time Conditions Maps

You can now gain access to a variety of maps directly:

  • Snow Percentages (SWE - NRCS SNOTEL)
  • Month to Date Precipitation (NRCS SNOTEL)
  • Water Year to Date Precipitation (NRCS SNOTEL)
  • Current Streamflows (USGS)
  • Soil Moisture (VIC Modeled)
  • National Drought Monitor



Snow Survey Data, Products, and Reports

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Snow & Precipitation

Current Water Year
Historical Data

30-Year Normals
Winter Recreation

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SNOTEL Data and Products National Web Site

Interactive Map, Idaho and Nearby SNOTEL Site Data

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Water Supply

Water Supply Outlook Reports
Surface Water Supply Index (SWSI)
Streamflow Forecasts
Peak Streamflow Information

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Site Information

Data site locations, maps, descriptions, etc.


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Soil Moisture, Weather and Climate

Soil moisture and temperature data, wind data, and general climate information for Idaho


Interim Issue Resolution: Air Temperature Data Bias

The extended range air temperature sensors used at SNOTEL sites in the continental U.S. calculate temperature from sensor output voltage using a linear least-squares regression algorithm. It has been determined that use of the linear least-squares regression algorithm has resulted in a data bias.

The Snow Survey and Water Supply Forecasting Program is actively working on a correction technique for this issue. 

More Information: Air Temperature Bias Correction Metadata and Resources

Additional Snow Survey Information