They have you coming and going on Crayfish.
Page 70, 2009 Minnesota Fishing Regulations”
Crayfish Crayfish may be used as bait only in the body of water where they were captured. The use of live crayfish as bait on the St Croix National Scenic Riverway (north of the Boomsite Boat Launch) and within Voyager National Park, units of the National Park System, is prohibited.
From the way this is worded you would think that you can use crayfish on the St Croix River as long as you are south of the Boomsite Boat Launch. But think again!!
Page 15, 2009 Minnesota Fishing Regulations
It is unlawful to:
– harvest bait (minnows, frogs, crayfish or other wild animals) from infested waters (pages 16 & 17).
Page 17, 2009 Minnesota Fishing Regulations
Minnesota Infested Waters
Zebra Mussels: St Croix River(downstream of the St Croix Boomsite Recreation Area)
So since the St Croix is infested with Zebra Mussels you cannot harvest bait period – from the Boomsite south to Prescott.
SO!! PLAIN AS MUD. NO CRAYFISH ON THE ST CROIX RIVER ARE ALLOWED.