It's Curtis. Yeah... Treehugger is right on. If you want to run the upper South Fork like the Canyon or Grand Jean, might I suggest some wide spots along Highway 21 past Lowman or Kirkam Hotsprings Campground. I've been crazy busy this summer, but I can show you down some of our local runs as well. The South Fork Canyon is my favorite.
Just tell everyone back in Colorado that Idaho is flat, full of potato fields, dry, and really boring.