I don't get out to fish too much (since Dave has me tied up on this site.. jk). Anyway I seen and talked to some people that have driven 4-wheelers and snowmobiles across the ice. I was able to snap some pics too.
Anyway the lake is big on a map, however I think it only averages 8 or 9 feet deep. I don't see much fishing on the North side (Celina) however the South side (Montezuma) is more of a hunting / fishing type of crowd.
(http://farm5.static.flickr.com/4068/4269885889_4ea3e2ef47.jpg)
(http://farm5.static.flickr.com/4039/4269914793_8ae2a5c701.jpg)