wisconsin spring floods can be a torrent. Most holes are formed by them. Think of a race car track and the banked walls. Rocks and sediment is placed in obvious places. Any irregularity to the banking warrants some casts. That island dead center in the photos causes the floods to raise up and drop rock/sediment just on the other side of the obstruction. The full force then cuts a large bath tub sized hole there. That is the prime lay in the hole...depth....near food...

The banking on the hole above is a smaller version of the spring flood forces.

Typically opposite side of cut out is where silt lays and is shallow.

This stretch is ultra spooky due to lack of trees on most of waterway.

This a over cast stretch.

The lips all along this waterway are productive.