My guess is this is the same Tundra Swan that summered at Sag Quarries in Lemont, Cook County last year.
---In <ILbirds...>, <maryloye@...> wrote :
There is a lone tundra swan on private property in Will County. It is behind a fence in a large retention pond on the SE side of Rodeo Dr and Dalton in Bolingbrook. Does not appear to be sick or injured. Viewable from the sidewalk but poor parking.