For the Milky Way to reach down close to its reflection requires the reflecting surface to have little obstruction above it. Large bodies of water have distant shores and that distant perspective usually results in lower shoreline sky obstructions. Small bodies of water are more likely to have a calm surface than large bodies but trees and mountains typically get in the way of the little-obstruction requirement. Mountains often bring elevation gain that tends to bring reflection-erasing wind.
This particular small mountain lake is set high enough for the southern view to open up to the sky while being protected from the wind for the perfect combination.
I love pointed spruce treetops and always welcome their great character on the horizon.
Reflections can be counted on to double the value.