Sorry - just had to do that.
I saw smelt in the title and got interested.
My wife and I used to dip them in the lower Niagara River.
Very tough walk down the escarpment and back up afterwards.
There are stairs but LOTS of them.
Anyway, I was just thinking a few days ago that the smelt should be there about now.
Anyway, I know nothing about the smelt runs in Caroga and cannot help you.
But good luck and I hope you get a bunch.