Crane Prairie comes with the same caveats as Hosmer. I know you can find cold water, but be responsible in that choice. Is the Channel cold? yes. But do you have to bring a fish up through 72 degree water to land them. If yes, then I don’t think it’s the right place to be fishing. But there are places in the Deschutes and Cultus area to completely avoid that temperature swing and stay in the safe zone on this hot days,. Also, go early. 
Balanced Leeches, Red 2 Bits, Black Double Down, Chironomids, Damsels Adults and Nymphs, Scuds and Water Boatman.