Just noticed this thread, I have caught quite a few bullheads in Devils Lake, actually on the Sullys Hill bay.One day years ago a guy came in with a bunch of perch caught there, went out and caught a bunch, next time launched a small boat caught a bunch of bullheads and perch that day.
I am the guy that wieghed the state record for Riley Zavada, but that one came off the culverts at the golden hiway before road went under, also wieghed all three of the striped bass records, spent way too much time in that damn baitshop!!
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As far as white suckers, fish the gates on channel A in the spring any amount of time and you will probly catch one, or like in the pic 57 bridge.