i went fishing at Bohemian creek at Ludwig park (by Protivin, near Spillville) last Thurs, i didn't stay long; but it only took me three casts to get a strike (and land the rainbow).   I didn't see any trouts rising during the 10 minutes i was there; but when i was there in late November i saw Many trouts rising (midges?  tiny BWOs?). 
I think that there are Way More holdover stocked rainbows there that you might think.