I'm planning on coming in via an old abandoned trail from Horseshoe Meadows -- along the South Fork Cottonwood Creek (Some maps show the old trail), then over New Army, maybe tag Langley, then on to Sky Blue. I'm planning on doing some fishing there and in upper Crabtree. Wish me luck!
BritonW, from the Crabtree ranger cabin, I headed south and a little eastward, and eventualy picked up the non-maintained trail up to lower Crabtree lk. It disappears in some big boulders at the lake's outlet, but climbing over those to the shoreline, you will find it again. I lost it again near the middle lake, but I see I was too far south. I spent a night on that sandy beach.
I caught one fish in the middle lake, but it was windy there, and I'm not a very good fisherman. The fish were hungry in the little pond between lower and middle Crabtree.