The last confirmed eruption of Mt. Shasta occurred in 1786, before reliable records were kept in the area, and casualty figures for the event are not known. It is known that the area surrounding the volcano was densely populated at the time, but the extent of the destruction remains unknown.
Mt. Shasta emerged during a mountain building epoch that began around 600,000 years ago. The volcano has remained active with eruptions occurring every 600 to 800 years during the last 10,000 years, though casualty figures have never been recorded. Mt. Shasta is regarded as dormant by the U.S. Geologic Survey, according to Wikipedia, but it has not become extinct.