The slush was the natural state of things that morning but I'll always try an experiment. There had been warm temps in Aspen up until the snowstorm and freezing temps the night before. This water was all slush except that one area along the right edge where it was totally unfrozen and gave a clear reflection. That area bothered me but I wasn't sure what to do about it so left it along.
What I learned about ice: Ice does not give good reflections. Slush gives some reflections sort of like looking through frosted glass. Water gives great reflections if the water is still enough. The more the water moves, the worse the reflections.