This is the one (or one of them). That's the scene of the miners on Mount Saint Helen's. I don't know where Bigfoot was getting all those rocks.
The one I remember was more of a professional "In Search Of" production, not this student film. It was mainly dramatizations of famous Bigfoot sightings. It had a theatrical release. It showed a map of the U.S. and how many Bigfoot reports each state had. People in the theater gasped when they showed how many Oregon had.