My Grandfather, Dad, and Uncle fished Grebe Lake in the late 1950s and caught nice size grayling. Those old photos are at my Mom's house somewhere. The first time I hiked into Grebe was before the big Yellowstone fire of 1988. Beautiful meadows and wild flowers by the lake and it had thick forest all around. The fire burned very hot in that area, but not so much around the lake. The burned areas are healing fast and many if the scorched trees have blown down. I'll never forget the first rainbow I hooked at Grebe, it was such a violent hit-run-jump-splash. Pheasant tails and damsel nymphs worked very well. Cascade Lake has grayling too.