Border Ice Development during freeze-up on the Susitna River, Alaska, November 6, 2013
Another awesome photo by PhD student Julia Blackburn, taken during freeze-up on the Susitna River, Alaska. The constriction of the river due to the rocky outcrop on the right, and the development of border ice on the left, make this location a good candidate for surface ice bridging to occur during the freeze-up process.
(Photo by Julia Blackburn: Nikon Coolpix AW100, f/3.9, ISO-640, FL 5 mm, 1/200 sec. exposure)