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Mount St. Helens (known as Lawetlat'la to the local Cowlitz people, and Loowit or Louwala-Clough to the Klickitat) is an active stratovolcano located in Skamania County, Washington, [1] in the Pacific Northwest region of the United States.
Mount St. Helens National Volcanic Monument is a U.S. National Monument that includes the area around Mount St. Helens in Cowlitz, Lewis, and Skamania Counties, Washington. [note 1] It was established by Congress on August 27, 1982, following the 1980 eruption. [2]
[9] [10] The area was later preserved in the Mount St. Helens National Volcanic Monument and due to the eruption, the state recognized the month of May as "Volcano Awareness Month" and events are held at Mt. St. Helens, or within the region, to discuss the eruption, safety concerns, and to commemorate lives lost during the natural disaster.
Prior to 1980, Spirit Lake consisted of two arms that occupied what had been the valleys of the North Fork Toutle River and a tributary. About 4,000 years ago, these valleys were blocked by lahars and pyroclastic flow deposits from Mount St. Helens to form the pre-1980 Spirit Lake. The longest branch of Spirit Lake was about 2.1 miles (3.4 km ...
State Route 504 (SR 504, designated as the Spirit Lake Memorial Highway) is a state highway in southwestern Washington state in the United States. It travels 52 miles (84 km) along the North Fork Toutle River to the Mount St. Helens area, serving as the main access to the Mount St. Helens National Volcanic Monument.
Mount St. Helens, once the fifth-tallest peak in Washington State, lost about 1,300 feet from its height of 9,677, according to the USGS. The highest part of the crater rim on the southwestern ...
A conifer forest will return to Mount St. Helens in its own time. On a debris-avalanche deposit totally devoid of life after May 18, 1980, plants are slowly taking hold of the landscape.
Coldwater Lake is located 8 miles (13 km) north of Mount St. Helens, 5 miles (8 km) west of Spirit Lake. Castle Lake, formed in the same manner as Coldwater Lake during the 1980 eruption, is located about 3 miles (4.8 km) to the south. The area is about 50 miles (80 km) northeast of Longview and 100 miles (160 km) north of Portland, Oregon. [4]