For this winter's caches here at Green Lakes I thought I would provide some facts about this great park.
This water contains a heavy load of dissolved minerals that are not present in water that enters through the surface from rain and snow. The lakes' waters also have a high concentration of calcium and magnesium. This mineral concentration leads to "whiting" events each year in which small crystallites of calcite and other minerals precipitate from the water. At these times the lakes appear particularly green, and the small crystallites are deposited in a layer underneath the lakes' waters.