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Although Mount St. Helens is in Skamania County, Washington, access routes to the mountain run through Cowlitz County to the west, and Lewis County to the north. State Route 504 , locally known as the Spirit Lake Memorial Highway , connects with Interstate 5 at Exit 49, 34 miles (55 km) to the west of the mountain.
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.
With the North American Plate overriding the Pacific Plate, episodes of volcanic igneous activity occurred. [6] The lateral blast from the 1980 eruption of Mount St. Helens was directed toward Castle Peak and stripped the vegetation from the slopes. [7] Due to Mount Saint Helens' proximity to Castle Peak, volcanic ash is common in the area. [8]
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Mount Saint Helens from the air, with Mount Adams in background ... Mount St. Helens; Metadata. ... Latitude: 46° 15′ 12.11″ N: Longitude: 122° 18′ 46.02″ W:
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 day before its 1980 eruption, Mount St. Helens was the fifth highest major summit of Washington. Today, Mount St. Helens is the 35th highest major summit of the state. This article comprises three sortable tables of major mountain peaks [1] of the U.S. State of Washington. The summit of a mountain or hill may be measured in three principal ...
Then, on May 18, 1980, the dramatic eruption of Mount St. Helens shattered the quiet and brought the world's attention to the range. Geologists were also concerned that the St. Helens eruption was a sign that long-dormant Cascade volcanoes might become active once more, as in the period from 1800 to 1857 when a total of eight erupted.