These are a little simpler than fish cribs to build and place around the flowage

These are harder than wood duck boxes, but easier than fish cribs.

Some old timers might object stating these raptors will kill too many fish. Let them know that any raptor worth it's salt can also kill wolf pup's that might improve the deer hunting.

How about building Loon nesting platforms.  I heard how loons are having trouble as they nest in the areas a racoon could get their eggs.  This would bring more loons to the Gile.