Haven't been in the Park, but the temperatures upstream have been consistently 62 in the early morning and around 64 late morning. Then I leave, so no idea if it jumps after that. It will only be up a few hours after a good rain. Valley drops faster than any stream I've ever fished. Around 20 CFS is considered "normal" by the USGS. It has been steady at around 15-16 CFS all summer. Still plenty of good holding areas. But fish it when it's 25 to 35 and you will pleasantly surprised. Won't happen very often.