Two years ago we had ice like that on one of our lakes, here in Northeast Ohio. There are 8 lakes in the chain and it was the only one like that. Had between 6-8 inches of ice and you could make out individual rocks in 14-15 fow. Was spooky walking out at first but the real spooky part was when you returned from deeper where you couldn't see the bottom and then all of a sudden you took a step and there it was. There was about 10 of us and in 4 hours I think there 3 fish caught. A few of us moved to another lake where you couldn't see thru the ice and caught a mess of fish.