A few years ago In-Fisherman magazine ranked Sandusky Bay #10 in it's list of 10 best catfishing spot in the country.

The Northern Ohio Catfish Tournament Trail has an event on Sandusky Bay - http://www.northernohiocatfishtournamenttrail.com/ .

The few remaining Lake Erie commercial fishing operations catch a lot of catfish. I don't know if they still fish Sandusky Bay.

The Maumee River also has good catfishing. There are several videos on YouTube showing guys catching big cats in the river.

If I remember correctly catfish in Lake Erie have slower growth rates than river or bay fish. But I've seen a few "monsters" (30-36 inches +) scuba diving in Lake Erie.