Snowy Mountain stands within the watershed of the Hudson River, which drains into New York Bay. The south end of the northwest side of Snowy Mountain drains into Little Squaw Brook, thence into the Cedar River, and the Hudson River. The north side of Snowy Mountain drains into Squaw Brook, thence into Indian Lake, Lake Abanakee, the Indian River, and the Hudson River. The northeast end of Snowy Mountain drains into Beaver Brook, thence into Indian Lake. The southeast slopes of Snowy Mountain drain into Indian Lake via Griffin Brook, Forks Brook, Willow Brook, and Falls Brook.