The minimum reading is correct and the upper limit is a guess.
This is the first waterfall on Chautauqua. It is a blind entry just before a right hand bend. You will know it's coming up when you see a cliff on the left side with no vegetation at all. It only drops about 5 feet but this area can be dangerous if there are strainers due to blind entry and very steep banks that may make it difficult to portage around the wood.