This pretty rapids is one of many channels of a large warmwater river.
I photographed this
Calopteryx maculata damselfly on some streamside grass while I was out with the Wisconsin DNR helping transplant some stranded sturgeon.
Always keep an eye on your waders for sign of caddisflies, both live adults and fresh eggs. Both are a sign that the adults are diving to lay their eggs on underwater objects (like your leg), and that means a diving caddis pattern (I like LaFontaine's) is probably the best fly to use.
The Namekagon is not known as a Hex hatch river, for good reason: the hatch is extremely rare and localized, and there are often few if any trout where the Hexes are. During this trip I caught nothing and heard no risers, but it was still a memorable night out in the middle of nowhere.