I have always used the topo maps as my guide and thus far have not been disappointed. What I have learned from some working biologist's that I know is that they used to stock everything they could until somewhere in (the mid?) the 70's. So anything that freezes solid is generally no good. After that it depends upon available food sources. Half the fun is figuring it out for yourself. Pan size is what you can usually expect, but there are definitely 18" trout out there. As wandering_daisy said, go to the out of the way places/hard to get to places.

Although this was a while ago, I have always had good luck at Gem Lake off the Silver Lake Loop trial entrance. Plenty of spots to check out at that lake without getting into anybodys way.

sk