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Snowpack Trend Graphs

Montana Snowpack Trend Graphs

Water Year snowpack trend graphs are available for the current water year October 1st through July, or as conditions warrant.

If you encounter any problems with the files provided on this page, please contact Lucas Zukiewicz at 406-587-6843.

Current Data (Current and Last Water Year)

For a detailed explanation of the new trend graph format using the non-exceedance projections see How To Read Non-Exceedance Projections Graphs.

Historical Data


Please note the following basins do not have graphs prior to water year 2012:

  • Blackfoot River
  • Gallatin River Basin above Gallatin Gateway
  • Hyalite Creek
  • Bridger Creek
  • Missouri River
  • Wind River
  • Big Horn River
  • Shoshone River
  • Tongue River
  • Powder River
  • Yellowstone River

See Wyoming Basin Forecast Trends on the Wyoming Snow Survey web site for the following basins affecting Montana:

  • Wyoming Big Horn River Basin
  • Wyoming Powder/Tongue River Basin
  • Wyoming Shoshone River Basin
  • Wyoming Wind River Basin