The last time that Crater Lake (Mount Mazama) was known to have an eruption was in 2850 BC. However, scinetists are not positive on this fact. Crater Lake has had very snall eruptions since the one about 7,700 years ago from new vent that formed inside the caldera. However, in the past 200 years there have been no eruptions from crater lake. All of these smaller eruptions occured within a 750 year period. Crater Lakes has had no eruptions for about 800-900 when Wizard Island was formed. When was Crater Lakes last (big) eruption?
The last time that Crater Lake (Mount Mazama) was known to have an eruption was in 2850 BC. However, scinetists are not positive on this fact. Crater Lake has had very snall eruptions since the one about 7,700 years ago from new vent that formed inside the caldera. However, in the past 200 years there have been no eruptions from crater lake. All of these smaller eruptions occured within a 750 year period. Crater Lakes has had no eruptions for about 800-900 when Wizard Island was formed. 
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geewiz that's amazing. I sure love Crater Lake and feeding those fish more than my family.
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