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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 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 ...
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.
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 ...
SR 503 Spur turns east at Beaver Bay Park and ends shortly thereafter at Forest Route 90 on the Skamania County line south of Mount St. Helens National Volcanic Monument and Gifford Pinchot National Forest. [1] [28] [29] The Lewis River Road was part of State Road 15 from 1909 until 1919 and was re-established in 1991 as a spur route of SR 503.
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 ...
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 ...
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.
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