September Brown Trout
I was digging through some old photos and found these, most likely taken by Feral, of me, on the Sturgeon River. Best guess, maybe ten years ago. At the end of September we would run into huge brown trout heading upriver to spawn, but it seems like those days are gone. The same thing took place on the Pigeon, huge browns up to two feet long, moving upstream. This hasn’t happened for years and I can only guess global warming has pushed the fall migration further into the year, possibly late November. We do catch a few lunkers, but nothing like the heyday. On a single trip up the Sturgeon, ten years ago, I caught four browns over twenty inches. We will be up there again this fall, checking those rivers, but maybe it’s the end of an era. I wish we had some answers. Note – we turned the big ones back and kept small ones for the skillet.
Fichigan 
I remember, about 10 years ago, an i-75 over sturgeon abutment repair that kept the river muddy from late July into October. I can’t find a record of it though. I wondered at the time if so much silt would damage the fishing. Haven’t seen any brook trout since then either.
We usually fish upstream the of I75 overpass, so I can’t answer your question. We do catch brook trout on the Sturgeon, but it is rare, most likely because brown trout have taken over.