Grass, Upper South Branch - Spruce Mountain to New Bridge (NY)
These are a rough estimate and may not actually represent the minimum and maximum flows needed.
Copper Rock falls consists of three drops. The first two are big class IV/V drops followed by the river splitting and a nice Class III slide on the left channel. Portaging this rapid is very easy due to a path along the left side of the river, with a nice big eddy and beach to pull out on.
This rapid can also be accessed from Toole Pond Road. There is a small path marked by a sign saying Copper Rock Falls is 0.5 miles from Newbridge.