I've seen as few as one person on the ice and as many as an estimated 80. I don't think they'd be fishing if there was no fish.
The ice is not thick enough for me to venture forth. I am not an ice fisherman and would want ice thickness about that of an 18' Lund.
What looks like the best way to the ice is to park on Broadway side and park in the motel parking lot. More people seem to head out that way than the Blue Heron park way. I think the ice is thicker on the Broadway side as there's less current.