Here are some more links to get more information:

http://www.nps.gov/crla/

http://en.wikipedia.org/wiki/Crater_Lake

http://www.nps.gov/archive/crla/home.htm

http://volcano.und.edu/vwdocs/volc_images/north_america/crater_lake.html

http://gorp.away.com/gorp/resource/us_national_park/or_crate.htm

http://vulcan.wr.usgs.gov/Volcanoes/CraterLake/framework.html

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