The west branch of the Mount Nemo Tributary of Grindstone Creek is a natural creek system. The Mount Nemo Tributary west and east branches flow into Grindstone Creek, and tributaries to Shoreacres Creek, Tuck Creek, Willoughby Creek, and Lowville Creek. The east arm of the west branch of the Mount Nemo Tributary originates as a headwater creek in the forested lands on the eastern half of the Nelson property.
The west arm of the west branch of this tributary contains fish and is therefore considered fish habitat. The east and west arms of the Mount Nemo Tributary (west branch) in the vicinity of the quarry also contain a number of wetlands which are fed by surface water from the subject lands. The east arm is also considered fish habitat because it contributes to fish habitat downstream (Grindstone Creek headwaters).