National Park Service

Southwest Alaska Network (SWAN)

Lake Ice Data


Water Year ‐ 2002

Lake Ice Chart Legend
Chart Legend

Water Year is Oct.-Sept. (i.e. Water Year 2004 = Oct. 2003 thru Sept. 2004)
Freeze Start = first time lake at or greater than 10%
Freeze Final = first time lake greater then 90%
Breakup Start = last time lake greater than 90%
Breakup Final = last time lake at or greater than 10%

See the pattern of ice on a lake across the years. Graph by lake

Information on how lake ice data is collected, About lake ice.

Last Updated: February 14, 2018 Contact Webmaster