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"It's not an unknown phenomenon, but it is relatively rare," said Loegering, who lives in rural Casselton, about 20 miles west of Fargo.
Allen Schlag, a National Weather Service hydrologist in Bismarck, and Greg Gust, a weather service meteorologist in Grand Forks, said a combination of cold, dense air last weekend and an eddy in the river likely caused the disk.
"It's actually quite beautiful," Schlag said.
"Ice discs form on the outer bends in a river where the accelerating water creates a force called 'rotational shear', which breaks off a chunk of ice and twists it around. As the disc rotates, it grinds against surrounding ice — smoothing into a circle." For more info: en.wikipedia.org...
reply to post by Signals
Maybe its where a UFO hovered to suck up water?
Maybe you could replace that disk with something solid with gear teeth, turn a reduction gear and generator?edit on 26-11-2013 by intrptr because: changed