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A Sight "Fearfully Grand"—Eruptions of Lassen Peak, California, 1914 to 1917: Fact Sheet 2014–3119. National Park Service, Lassen Association, and the United States Forest Service. Foxworthy, B. L.; Hill, M. (1982). Volcanic Eruptions of 1980 at Mount St. Helens: The First 100 Days (U.S. Geological Survey Professional Paper, 1249).
Highest point; Elevation: 6,896 ft (2,102 m) NGVD 29 [1] Coordinates: 1]: Geography; Location: Lassen and Shasta counties, California, U.S.: Parent range: Cascade Range: Topo map: USGS Prospect Peak: Geology; Mountain type: Extinct Cinder cone: Volcanic arc: Cascade Volcanic Arc: Last eruption: 1666: Climbing; Easiest route: Trail hike: Cinder Cone is a cinder cone volcano in Lassen Volcanic ...
The 29 mi (47 km) Main Park Road was constructed between 1925 and 1931, just 10 years after Lassen Peak erupted. Near Lassen Peak the road reaches 8,512 ft (2,594 m), making it the highest road in the Cascade Mountains. It is not unusual for 40 ft (12 m) of snow to accumulate on the road near Lake Helen and for patches of snow to last into July.
California's last major destructive volcanic eruption came more than a century ago. Lassen Peak underwent a series of eruptions between 1914 and 1917.
The last major eruptions of Lassen Peak occurred in April through June 1917, when a new crater was created at the summit of the mountain. Less explosive activity continued through 1921. [1] [24] The Smithsonian considers the eruption of Mount Lassen to have ended on June 29, 1917. [36]
Loomis was a local homesteader and photographer who documented the 1915 eruptions of Lassen Peak, and was instrumental in the 1916 establishment of the national park. In 1929 Loomis donated the museum and 40 acres (16 ha) of surrounding lands to the National Park Service , which since then has used the structure as an interpretational facility.
The Chaos Crags event may have been fed by the same reservoir of crystal-containing magma as the 25,000BCE and 1914-1921 eruptions at Lassen Peak, based on shared zircon age spectra, [24] composition, and phenocryst makeup, suggesting that they have all been fed by the same reservoir of crystal-containing magma. [25]
Lassen Volcanic National Park has a lot in common with its famous sister parks, but far fewer visitors.