It actually is the Sandy Glacier Caves on Mt. Hood. This was taken around Thanksgiving last year (2015). My brother, who lives in Portland, had gone in 2014 and when we went in 2015 he said the caves were unrecognizable. I'm sad to hear they are completely collapsed now, although I suppose it was inevitably going to happen pretty quickly.

Anyway, since you guessed it OM and already have a photo up, I suppose we are back to one at a time. At least it will make things less confusing!