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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.
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.
The Mount St. Helens Visitor Center at Silver Lake, about 30 miles (48 km) west of Mount St. Helens and five miles (8 km) east of Interstate 5 (outside the monument), opened in 1987 by then-Vice President George H.W. Bush. The center was formerly operated by the U.S. Forest Service and has been operated by Washington State Parks since October 2007.
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 ...
On March 27, 1980, a series of volcanic explosions and pyroclastic flows began at Mount St. Helens in Skamania County, Washington, United States.A series of phreatic blasts occurred from the summit and escalated until a major explosive eruption took place on May 18, 1980, at 8:32 am.
The eruption of Mount St. Helens on May 18, 1980, created a lahar or debris avalanche that rushed down the North Fork of the Toutle River, burying the whole valley up to 600 feet (180 m) deep. The lahar backed up Coldwater Creek for more than a mile (1.6 km), damming the creek and its tributary South Fork Coldwater Creek to a height of 180 feet ...
Mount St. Helens seen from the Windy Ridge Viewpoint in 1985 Windy Ridge is at the center of this map of Mount St. Helens National Volcanic Monument. Windy Ridge is a ridge and eponymous Forest Highway in the Mount St. Helens National Volcanic Monument. The ridge goes between Windy Pass and Independence Pass, 1 mile (1.6 km) east of Spirit Lake ...
The Dome is a 5,720+ ft (1,740+ m) mountain summit located in Mount St. Helens National Volcanic Monument, in the Gifford Pinchot National Forest, in Skamania County of southwest Washington state. [3] It is situated in the Cascade Range, less than 2 mi (3.2 km) north of Spirit Lake, and 1.28 mi (2.06 km) northeast of Coldwater Peak.
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