Gore Mountain stands within the watershed of the Hudson River which drains into New York Harbor. The south end of Gore Mtn. drains into Black Mountain Brook, thence into Chatiemac Brook, North Creek, and the Hudson River. The southeast slopes of Gore Mtn. drains into Straight Brook, thence into North Creek. The northeast slopes of Gore Mtn. drains into Roaring Brook, thence into North Creek. The north west and west slopes of Gore Mtn. drain into the headwaters of the East Branch of the Sacandaga River, thence into Hudson River.