Fuller observes, "Hayden Valley is riven with many of these hydro-thermal areas, most unnamed and little known.  Difficult and often dangerous winter conditions and an abundance of summer grizzly bears deter most visitors from exploring the region beyond the edge of the highway." Photo by Steven Fuller.  Click to enlarge
Fuller observes, "Hayden Valley is riven with many of these hydro-thermal areas, most unnamed and little known. Difficult and often dangerous winter conditions and an abundance of summer grizzly bears deter most visitors from exploring the region beyond the edge of the highway." Photo by Steven Fuller. Click to enlarge