PHOTOS: Ice circles on Cannon River in Northfield, Minn.

I took these at the Cannon River dam in Northfield yesterday at 12:15 p.m. I would love to know more about how these ice circles form! Keith? - Lori Rahman

Those look like ice circles or ice pans… usually formed in slow-flowing water within small eddies. These form, then move on out of the eddy -- very cool! – Keith Marler

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