Every named stream in the Adirondack Park — the feeder waters that line the High Peaks valleys and fill the ponds.
Icy Brook drains the north slopes above Keene — a cold-water tributary that feeds into the East Branch of the Ausable, likely named for its year-round temperature rather than any winter peculiarity. No formal trail follows the brook, and no fish stocking records appear in the DEC database, which means it's either too small, too steep, or both to hold much beyond the occasional native brook trout in the lower pools. The name shows up on USGS quads and in old watershed maps, but you won't find much beta online — this is the kind of water you'd cross on a bushwhack or notice from the road without ever seeing it called out on a trailhead sign.
