I'm lowsy on directions so try to follow me. I heard that 15-18" rainbows were being caught at the first campground. Don't ask me where the first one is, because I haven't been there in 5 years. This is just what I heard. Good Luck!
granby was one of my home waters here are my suggestions this time of year. mile post 9 onhwy 34 there is a boat ramp and camp ground. right next to it is a bay depending on how much water. for trout use a pather martin silver blade with yellow bell with red dots. for macs on sunny days silver castmasters also silver with red stripe or green stripe. over cast days castmaster copper or orange. cast out and let it drop to the bottom and then begin a slow retirive. if you want browns try shoddaw mountain on the other side of the dam. try the above lures and a rapala sinking brown trout about 3 inhes. good luck and let me know how you did.