Upper Grinnell Lake has been formed by the melting of the Grinnell Glacier.
As the glacier retreated, or melted, the melt water formed a lake in
the depression where the glacier use to be. As Upper Grinnell Lake is
fed entirely by either the melting of the glacier or from snowmelt, the
color of the lake is milky white and has no nutrients (and thus no fish).
Additionally, as Grinnell Glacier melts, big chunks of the glacier frequently
break off from it. When this happens, the chunks of ice can float around
in the lake for weeks at a time. Seen here is Upper Grinnell Lake in
October, still full of floating ice.
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