There are multiple ladders/stairs on the Grafton Loop Trail. Southbound on the Western side of the trail coming off, I believe Bald Mountain, there is a series of 10 or 12 sets of steep wooden stairs.
The falls only exist during spring runoff or after heavy rains (June was our 7th rainiest on record) and are unnamed as far as I know. It is located near the former, now abandoned, Fire warden's Trail. I have see ice climbers on that pitch as well. I agree with peakbagger, Sunday River Whitecap...