I call this a "canoe route" not knowing the regularity with which travellers navigate the waters. One spring when the water was still high we saw an overturned row boat wedged at the top of the cataract and a canoe protruding from the water beneath.
By mid summer when the water is low (as in the photo) it is possible to duck through the cascade and find oneself in a hanging shelf that undercuts all along behind the falls. As the river is wide and shallow, flowing over limestone at the edge of the Canadian Shield, it is unusually warm. Exploring the cavity is quite an experience as the roar is deafening. I floated along neck deep in churning froth, a wall of translucent yellow water to one side, the undercut shelf to the other.
It is possible to see almost to the other side of the river along this strange, eerily lit tunnel (a distance of about 50 metres). The light glows through the watery curtain and I am reminded of the rumour of the spectral appearance of a mother and daughter who drowned in one of the local rapids.