Today was day 2 with Ivan and Greg.  We floated the Lower Sac from the Posse Grounds to Bonnyview.  The bite was pretty slow at first, but got progressively better from 11am to 2:30pm when we got off the water.  The fish seemed really packed into the fast, shallow riffles and the heads of the riffles.  We did well anywhere where we could cast our nymphs into the very top of a riffle.  We hooked four fish in our last spot - guess where that would have been.  Our best flies were a natural birds nest size 14 and a size 18 red copper john.  Ivan and Greg both landed nice big wild rainbows today.