Couldn't find the summit sign on top, even though I looked around for a bit. Still, we were definitely at the highest point on the highest 'bump' of Cliff. +7C on the summit in February! Amazing.
Regarding the monument you see pictured above: David Henderson (a miner in the early 1800s), his son, and a guide were scouting for reasons associated with the Tahawus mine when they reached a small pond inhabited by some ducks. Henderson handed his gun to Cheney to shoot the birds, but he didn't get a shot off. Returning the firearm to Henderson, Henderson put it in his backpack, which he soon set on a rock. The gun went off, fatally wounding Henderson. The pond was named Calamity Pond, and the stream flowing through it became known as Calamity Brook. The monument you see at right was placed at the spot where Henderson lost his life; it was sledded in several winters after the accident. more information available here