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Lassen in Wikipedia

Volcanic park Lassen

Lassen Volcanic National Park is a United States National Park in northeastern
California. The dominant feature of the park is Lassen Peak; the largest plug dome
volcano in the world and the southern-most volcano in the Cascade Range.
Lassen Volcanic National Park started as two separate national monuments designated
by President Theodore Roosevelt in 1907: Cinder Cone National Monument and Lassen Peak National
Monument. Lassen Volcanic National Park is one of the few areas in the world where all four types of volcano can
be found (plug dome, shield, cinder cone, and strato). Starting in May 1914 and lasting until 1921, a
series of minor to major eruptions occurred on Lassen. These events created a new crater, and released lava
and a great deal of ash. Fortunately, because of warnings, no one was killed, but several houses along
area creeks were destroyed. Because of the eruptive activity, which continued through 1917, and the
area's stark volcanic beauty, Lassen Peak, Cinder Cone and the area surrounding were declared a National Park
on August 9, 1916. The 29-mile Main Park Road was constructed between 1925 and 1931, just 10 years after
Lassen Peak erupted. Near Lassen Peak the road reaches 8,512 feet, making it the highest road in the
Cascade Mountains. It is not unusual for 40 ft of snow to accumulate on the road near Lake Helen and for
patches of snow to last into July.