Bibliography:

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

http://pubs.usgs.gov/fs/2002/fs092-02/

http://www.destination360.com/north-america/us/oregon/crater-lake.php

http://pubs.usgs.gov/gip/volc/types.html

"Earthquakes and Volcanoes" Grolier Educational 

Address

Crater Lake National Park

BOX 7

Crater Lake, OR 97604

United States

Phone 1 (541) 594-3100

Fax 1 (541) 594-3010

If you want to visit Crater Lake park cost is fore adults $10.00

IN THIS PICTURE YOU CAN SEE THE STRUCTURE OF CRATER LAKE. The structure is Caldera.

Crater Lake in Oregon, USA is the second deepest lake in North America and the ninth deepest on the planet. Crater Lake is famous for its deep blue color and  fore water clarity.

Volcanic activity in the area is fed by subduction off the coast of Oregon as the Juan de Fuca Plate slips below the North American Plate.

Last known eruption: 2850BC (?)

Most recent eruption 7,700 years ago.

Mazama is most famous for a catastrophic volcanic eruption that occurred around 5,677 (± 150) BC.[1][3] The eruption, estimated to have been 42 times more powerful than Mount St. Helens'

• Avarage hight from crater lake's surface to caldera rim. About 1,000 feet (305 m)
  
• The hight of the Mount Mazama volcano used to be 4,500 meters high
• Lake surface area 21 square miles( 54.4 km2)
• Lake is 11 kilometers across, and water is over 600 meters deep.

  

Crater lake lies inside the top of an ancient volcano known as Mount Mazama. 

Type of volcano: 

• cinder cone what became Caldera. The caldera formed about 6800 years ago as a result of the eruption of about 75 km3 of rhyolite magma in the form of tephra, found as far away as Canada, accompanied by pyroclastic flows that left thick deposits of tuff on the flanks of the volcano. Subsequent eruptions have built a cinder cone on the floor of the caldera, which now forms an island called Wizard Island. 
  
• continental

Geologic location: America, state of Oregon.

The cities nearby:Ashland (56,5 miles),Grants pass(78.6 miles),Medford( 80 miles)Bend(88 miles),  Eugene(91.7 miles).

Closest Volcano: Davis Lake

• Non-explosive
• Basaltic lava
• The hazarrds is Pyroclastic flow
  
• The only damage crater lake does to any towns or roads is from pyroclastic flows that will rip tear and kill anything in is path
  
• There is lot earthquakes from crater lake magnitudes at 5.9 and 6.0, those earthquakes are damaging to the town
• the most damaging thing to people from wizard island is a pyroclastic flow. Pyroclastic flow it reaches farther away from crater lake and moves quickly.  After an eruption ash clouds will cover some of crater lake but  the clouds will not go into any towns. 
  

Crater Lake lies in the caldera of a Cascades volcano. The Cascades are the result of the small Juan de Fuca plate being subducted under the North American plate (convergent boundary), partially melting, then rising as magma to form a chain of volcanoes. Since the surface boundary between the plates is offshore, the volcanoes themselves are located on the North American plate.