This was taken Christmas day just after a new snow following an extended, cold and dry period. The Eagle River had lots of overflow where there is not enough room for water to flow under the ice and it is forced to the surface above the ice. It can remain liquid under the snow even in extreme cold. It can be a very dangerous when found unexpectedly. It can also be quite beautiful.
Alaska is the largest state in the United States by area. It is situated in the northwest extremity of the North American continent, with Canada to the east, the Arctic Ocean to the north, and the Pacific Ocean to the west and south, with Russia further west across the Bering Strait. Approximately half of Alaska's 710,231 residents (as per the 2010 United States Census) live within the Anchorage metropolitan area. Alaska is the least densely populated state of the U.S.Source: http://en.wikipedia.org/wiki/Alaska