Unfortunately you are correct.Just look at the statistics from P F, or USDA of crp acres falling to the plow...South Dakota included.This summer I rode my motorcycle to the Loess Hill and then went acroos Iowa over to the Miss River and rode the river rode.
Biggest mistake was crossing Iowa. I thought Western Ks was boring. Beans a mostly corn for as far as the eye could see. No habitat whatsoever. It's no wonder populations are dwindling. I know this is just a small part of the state I was in but I couldn't imagine it being too much different elsewhere.
Heading out to my little corner of the world Friday looking forward to Iowa opener, yet somewhat saddened because I know there will be freshly disturbed soil that was once beautiful habitat