Although the Au Sable brings a hint of flyfishing aura with it, thats not the only method employed for catching trout. Below Mio, in the trophy waters, special regulations are in effect (please check the regulations, don't take my word alone) for size, creel, and methods allowed for fishing. Artificials only, I believe, between the power line and McKinley bridge. Mepps & Panther Martins are a good choice. As are Rapalas or Bombers. Work the runs and holes. Drifting that section allows for covering much more water when you are in search mode.

 

This time of year, rapalas (5"-7") work really well right at dark and just after. If you are going to fish during the day time, try to find some riffles that break up the light going into the water. Although you may want to upgrade a little from the ultralight when using larger size rapalas. Some of those hogs get really warn out trying to land on really light stuff.