I've found what seem to be concrete slabs in several places out there. I'll see a real strong return on the sonar and a flat bottom. Think I snagged up on one by the islands near 43 last time I was catfishing.
Also, there's several sunken bridges in that lake. I've found three, but there may be more. Not going to give away their locations.
I used my underwater camera to get a look at them. They're still relatively intact, the planks and supports are still there. Never seen too many fish around them, but they're below the thermocline most of the year.
I posted a few of the vid clips I took of the bridges in a set on my flickr page. The video quality isn't great because I was recording the video screen with my pocket camera. The poor water clarity in Mogadore really cuts down the camera range too.
[ame="http://www.flickr.com/photos/polymerstew/sets/72157630395228214/"]Sunken Bridges - a set on Flickr[/ame]