McKinnons is "closed" but if you go there on any given day you'll see 5+ vehicles and a wide open gate.
There is still some ice shelves but I floated from Policemans to Mckinnons last weekend no problem. Just avoid the rough water.
Ps, also highly recommend you plan your exit before starting your float. Like I said, lots of shore locked up in ice. But there is a nice little nook right infront of Mckinnons you can pull into. No way you're getting a boat in there though, kayaks and inflatables.