Ice ridging on the Athabasca River, AB (Canada), April 21, 2000
In the early stages of breakup, individual ice sheets will move slightly – as the flow drag on the underside of the ice cover encourages them to push downstream. The result is ice ridging. Nothing too dramatic – but still, I think it looks beautiful.
(photo by UofA River Ice Group: Nikon E950, f/7.4, FL 7 mm, 1/261 sec. exposure)