The top picture was at Madison St. and the bottom picture was on Michigan Ave. While this isn't exactly the first time I've seen ice on the Chicago River, it never occurred to be how frozen the river can get. Almost looks good enough to skate on although I'm not sure it's recommended.
BTW,
this is a pic I saw taken during the recent "polar vortex" cold snap. That pic looks thawed compared to this one. This was shared with
Chicago's ABC affiliate.