Q – Is there evidence elsewhere in the world of ice age floods? Intuitively, I would think glaciers dammed other rivers, created lakes and then eventually collapsed?

A – Your instincts are correct.  The rivers with big ice and big gorges pretty much all had outburst floods on them.  The St. Lawrence Seaway is a flood path as is the Strait between Denmark and Norway and the English channel at the Dover Straits.  The Altai Mountain Floods in Mongolia were very steep and fast much like Lake Missoula.  The latitude where the ice was melting on its own appears to be more susceptible to very large floods.  The Tibetan Plateau also had a series of large floods.