Bill,
When I was a kid, my grandpa would task me with collecting crayfish for the next day or so fishing trip for YP. He preferred soft shelled (recently molted), but was not fussy.
The place I went to was Sand Creek, about 1/4 mile from home. The bridge was rebuilt over the creek in previous years and a lot of the concrete chunks from the bridge, kinda fell in the water. OOPS!
Anyway, it was a hot spot for collecting crayfish. Some say Cray, some say Craw. Grandpa was thrilled with what I collected. Not a clue as to what species tho, but this was in the late 60's to early 70's.
Buzzed down to the creek under the bridge about 18 years ago. Bridge was rebuilt again, but the the same chunks of concrete seemed to be in place. You never forget those things. Collected a few crays, and they were all Rusties. I put some in a tank with rock as structure and tossed dead minnows to them. Did fine, but quite illegal now.
Supposedly good for a crayfish boil tho. State want's you to eat them.