Dry Falls
This lake is one of a number of plunge pools left behind when
Glacial Lake Missoula's debris-clogged waters rushed over the
rocky precipice known today as Dry Falls. Picture floodwaters more
than 250 feet deep pouring over a falls five times wider than
Niagara, and you get an idea of the immensity of the flood. Note
the huge, water-carved potholes known as "kolks" (at right in
image).