Every named stream in the Adirondack Park — the feeder waters that line the High Peaks valleys and fill the ponds.
Harrington Brook drains into the Raquette Lake system — a named tributary on the USGS quad but otherwise undocumented in angling or paddling literature. No trail follows the brook directly, and access likely means working upstream from the Raquette shoreline or crossing private land; check the DEC public-use map before bushwhacking. The brook holds native brookies in theory, but you're fishing on faith — no stocking records, no local beta, no lean-to rumors. If you find good water, keep it to yourself.