I was there in July for two weeks. I recognize most of the spots in your photos. I camped at the Ruedi Res. The fishing was spectacular. I was sitting in the exact same spot in the last photo you posted. It was quite pretty there. The fish were all over the place and testing my skills for sure. I think I posted some of the photos from the FP on this site already... http://www.flyanglersonline.com/bb/showthread.php?37833-Before-the-Night-of-the-Grizzlies
It's already a return trip planned for next summer for me. Down river I was getting them on Para Adams, Tan X-Caddis and Potter's Opal Caddis. Up river I was using Charlie Cravins version of a Mysis Shrimp that I took liberties with and changed it up ever so slightly. It worked for me. Small PT nymphs worked well up there too. So did a light olive green Klinkhammer.