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Surface Water Supply Index Maps and Reports
The Surface Water Supply Index (SWSI) is designed for areas that rely on snow melt as the primary source of surface water. The SWSI accounts for snowpack, mountain precipitation, streamflow, reservoir storage, and soil moisture conditions. The SWSI is used by irrigators, fisheries specialists, recreationalists, and others to evaluate current and seasonal surface water supplies.
Core Months: 2006 to Present
See All Months 1992-Present
March 2013 PDF GIF Report |
April 2013 PDF GIF Report |
May 2013 PDF GIF Report |
June 2013 PDF GIF Report |
July 2013 |
August 2013 |
March 2012 PDF GIF Report |
April 2012 PDF GIF Report |
May 2012 PDF GIF Report |
June 2012 PDF GIF Report |
July 2012 PDF GIF Report |
August 2012 PDF GIF Report |
March 2011 PDF GIF Report |
April 2011 PDF GIF Report |
May 2011 PDF GIF Report |
June 2011 PDF GIF Report |
July 2011 PDF GIF Report |
August 2011 PDF GIF Report |
March 2010 PDF GIF Report |
April 2010 PDF GIF Report |
May 2010 PDF GIF Report |
June 2010 PDF GIF Report |
July 2010 PDF GIF Report |
August 2010 PDF GIF Report |
March 2009 PDF GIF Report |
April 2009 PDF GIF Report |
May 2009 PDF GIF Report |
June 2009 PDF GIF Report |
July 2009 PDF GIF Report |
August 2009 PDF GIF Report |
March 2008 PDF GIF Report |
April 2008 PDF GIF Report |
May 2008 PDF GIF Report |
June 2008 PDF GIF Report |
July 2008 PDF GIF Report |
August 2008 PDF GIF Report |
March 2007 PDF GIF Report |
April 2007 PDF GIF Report |
May 2007 PDF GIF Report |
June 2007 PDF GIF Report |
July 2007 PDF GIF Report |
August 2007 PDF GIF Report |
March 2006 PDF GIF Report |
April 2006 PDF GIF Report |
May 2006 PDF GIF Report |
June 2006 PDF GIF Report |
July 2006 PDF GIF Report |
August 2006 PDF GIF Report |
These data are compiled by the Montana Snow Survey Program of the USDA Natural Resources Conservation Service. Please see their web site for explanations of their data collection programs.
For additional information, contact:
Brian Domonkos, Water Supply Specialist
Natural Resources Conservation Service
brian.domonkos@mt.usda.gov
(406) 587-6991