Ice was safe at 4-5" but it was a very warm day. Watch the weather if you're thinking about going soon. We were only there a couple hours but saw no fish caught with plenty of folks around us trying. Most people who passed us on their way to leave had not much good to say, but it could change any moment. We did mark fish but no bubbles.
Used a variety of jigs, worms, and spoons.
Scoopy the snowman is all we had to show for our trouble.