Rotten snow makes me happy. Dirty rotten snow! You have to live here to get it but rotten snow, snow tainted by salt and grit is best. Best for walking that is. Sometimes it is formed by weather but most often it is simply adulterated. It gives under your footsteps and gives you good footing. My mid January we all want to stride out, to firmly place our feet on the path and make confident tracks. . . not waddle like a penguin.