Hopkinton Brook.

Hopkinton Brook drains north through the Tupper Lake region — one of those named tributaries that appears on DEC maps but doesn't pull the same attention as the bigger flowages and ponds in the area. No fish species data on record, which likely means it's either not stocked or simply under-surveyed; small Adirondack brook trout streams often fly under the radar until someone with a three-weight and a GPS bothers to log them. The brook connects to the larger watershed feeding Raquette River drainage, part of the low-gradient, marshy corridor that defines the northwestern Park. Access and put-in details are sparse — if you're heading out here, bring a topo and expect to do some scouting.