I know that many river systems in WI have redhorse as well as white suckers. We used to catch a mix of both in small creeks that fed into the WI River when I attended UWSP.
I grew up on a creek that fed into Lake Michigan and we got a nice run of them every spring. I'm nearly positive that those were all white suckers. I'd guess that they'd be in the tributary rivers and creeks right now.
Smoke 'em, pickle 'em or mince them up and make fish patties.