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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 ...
Superheated flow material flashed water in Spirit Lake and North Fork Toutle River to steam, creating a larger, secondary explosion that was heard as far away as British Columbia, [36] Montana, Idaho, and Northern California, yet many areas closer to the eruption (Portland, Oregon, for example) did not hear the blast. This so-called "quiet zone ...
Harry R. Truman (October 1896 – May 18, 1980) was an American businessman, bootlegger, and prospector.He lived near Mount St. Helens, an active volcano in the state of Washington, and was the owner and caretaker of Mount St. Helens Lodge at Spirit Lake near the base of the mountain.
Twenty years after the 1980 eruption, trees killed by the blast were still standing. In its undisturbed state, the slopes of Mount St. Helens lie in the Western Cascades Montane Highlands ecoregion. [50] This ecoregion has abundant precipitation; an average of 93.4 inches (2,373 mm) of precipitation falls each year at Spirit Lake. [51]
The North Fork Toutle River is a tributary of the Toutle River in southwestern Washington in the United States. The river has its headwaters near Spirit Lake, on the north side of Mount St. Helens, and flows 39 miles (63 km) to the Toutle River, [3] about 17 miles (27 km) upstream of its confluence with the Cowlitz River. [4]
It's not uncommon for an earthquake to have a ripple effect creating giant waves after water has been displaced — commonly known as a tsunami.
In March 1980, Mount St. Helens was struck by an earthquake swarm that indicated potential eruptive activity for the volcano, which had been dormant for over a century. [46] The Forest Service established a roadblock on SR 504 approximately 4 miles (6.4 km) west of Spirit Lake on March 28 because of potential avalanche risks. [47]
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