I haven't been at it that long, but I imagine some of the trestles in Wolcott will become hazardous. The train trestle on Gore Creek above the chute will get nasty (even in moderate years it becomes a strainer). I'd love to see what kind of a hole it makes if the water goes over the train tracks!
Gore Creek above Vail Village may be difficult with bridges, and lots of it will wash out. I bet upper-upper Gore Creek in the Eagle's Nest wilderness might be interesting hair boating for someone at high water.
Someone mentioned that the bridge pylon below the chute makes things really tricky at higher water. I would imagine some of the old bridges below Wolcott could get interesting. Lots of trees could dis-lodge, ones that have been in decent places for the past couple years. As far as creeks, I don't know if stuff like Brush Creek, or Sandstone, Beaver Creek, etc. will be doable, I never really look at those. Piney river might flush out some wood. Same deal, I don't know much about it, I am a sucky kayaker.
Does anyone know what happens to the Edwards mile if the chute gets up to 10+++ feet on the gauge? Some of us were trying to decide if it becomes gnarly, or if it becomes a lake.