Arethusa Falls is generally regarded as the highest single drop in New Hampshire. It’s not, Dryad Fall is a 300-foot horsetail, but Arethusa Falls is by far the more spectacular. Bemis Brook drops over a broad orange granitic cliff, capping a 1.5-mile hike along (mostly far above) Bemis Brook. Arethusa’s height figure is fairly suspect. Let me offer some clarification before I hear the inevitable hymns of protest. I eyeball the total height at about 140 feet, which is consistent with estimates printed in early editions of the AMC White Mountain Guide. Professor Huntington and Moses Sweetser measured the falls at 176 feet in 1875. The vertical portion of the falls (that which is visible from the base) is likely about 120 feet in height. As you descend to the base of the falls from the recently rerouted trail, you can see some upper slides through the trees. Taking those into account, I’ll buy 140-foot total. At either height, this waterfall is a not-to-be-missed feature of the White Mountains.