When I was in grad school in Boulder in the 1990s, I remember going to Eldorado Springs with a friend. He would fill up water bottle from a hose that gave out the free mineral springs water. I hadn't thought about there being a pool there, but this imagine reminded me there was one. I never swam in it, though.
Animation from a LOC stereograph
More of my animated stereographs here.
Click to embiggen.
Animated GIF made from 
