Just got back from Island Park, snow wasn't bad you can still find untracked areas if you know where to look. I left yesterday in the am and at ipv resort there was 5" new snow so up high there should have been at least 12", it is worth the drive to ride there.
I just spent all afternoon in the Eccles, Mesa Falls, Warm River springs area. There is around 18" of new from the storm this weekend. Even at this somewhat lower elevation than much of IP, the fence posts are ALMOST covered, if I venture a guess I would say 4-5' total.