Ice Jams

Montana has the highest incidence of ice jams in the lower 48.

• Interactive Map of Montana Current and Historic Ice Jams from the USACE CRREL Ice Jam Database
• Summary Reports for Montana, such as ice jams by water year, month, and river
• ​Table of Montana Ice Jams (1894-2015) extracted from the USACE CRREL Ice Jam Database (download in .csv format)​
  • For addtional queries please click here for the USACE CRREL Ice Jam Text Query

• What are Ice Jams?
  • Description from the Great Falls National Weather Service
  • Ice Jam Story Map from Carbon County, MT
  • Description from the U.S Army Corps of Engineers Cold Regions Research and Engineering Labratory (USACE CRREL)

• Montana News Articles about Ice Jams
  • Billings Gazette 2014: "Ice jams continue to wreak havoc on Yellowstone, Little Bighorn rivers"
  • Havre Daily News 2014: "People warned to be aware of dangers of ice jams"
  • Spokesman-Review 2003: "Montana River Ice Jams Cause Minor Flooding"