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In page Crater Lake:
"Due to several unique factors, mainly that the lake has no inlets or tributaries, the waters of Crater Lake are some of the purest in the world because of the absence of pollutants. Clarity readings from a Secchi disk have consistently been in the high-30 meter to mid-20 meter (80 to 115-foot) range, which is very clear for any natural body of water. In 1997, scientists recorded a record clarity of 53.3 m (175 ft).
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