Sir William Howard Russell,
Canada; its Defences, Condition…
“ In the centre of the Horseshoe, which is really more the form of two sides of an obtuse-angled triangle, the water, being of great depth—at least thirty feet where it falls over the precipice—is of an azure green, which contrasts well with the yellow, white, and light emerald colours of the shallower and more broken portions nearer the sides. ”
