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2006-12-04 11:18:38 · 5 answers · asked by GIni D 1 in Science & Mathematics Geography

5 answers

Washington State in the Cascade mountain range.

Check this link, lots of neat stuff including a volcano cam.
http://vulcan.wr.usgs.gov/Volcanoes/MSH/framework.html

2006-12-04 11:20:11 · answer #1 · answered by ©2009 7 · 0 0

It's in the state of Washington about 150 miles south of Seattle and 40 miles North of Portland Oregon. It is a wonderful National Park and many walking trails. A visit there would be well worth your while. Access roads are very good and the facilities are execellent.

2006-12-04 11:25:19 · answer #2 · answered by ironduke8159 7 · 0 0

Mount St. Helens is an active stratovolcano in Skamania County, Washington, in the Pacific Northwest region of the United States. It is located 96 miles (154 km) south of the city of Seattle and 53 miles (85 km) northeast of Portland, Oregon. The mountain, part of the Cascade Range, takes its English name from the British diplomat Lord St Helens, who was a friend of George Vancouver, an explorer who made a survey of the area in the late 18th century. Mount St. Helens is a part of the Pacific Ring of Fire that includes over 160 active volcanoes. This volcano is well known for its ash explosions and pyroclastic flows.

Mount St. Helens is most famous for its catastrophic eruption on May 18, 1980.[1] The 1980 eruption of Mount St. Helens was the most deadly and economically destructive volcanic event in the history of the United States. (In 1912, Mount Katmai, Alaska, was the site of the largest volcanic eruption in U.S. history.) Fifty-seven people were killed; 250 homes, 47 bridges, 15 miles (24 km) of railways and 185 miles (300 km) of highway were destroyed. The eruption caused a massive debris avalanche, reducing the elevation of the mountain's summit from 9,677 feet (2,950 m) to 8,364 feet (2,550 m), and replacing it with a mile-wide (1.5 km-wide) horseshoe-shaped crater.[2] The debris avalanche was up to 0.7 cubic miles (2.3 km³) in volume, making it the largest in recorded history.[2] However, the scale of the blast pales in comparison with debris avalanches that have occurred in the geological past elsewhere on Earth.

Like most other volcanoes in the Cascade Range, Mount St. Helens is a great cone of rubble consisting of lava rock interlayered with ash, pumice and other deposits. The mountain includes layers of basalt and andesite through which several domes of dacite lava have erupted. The largest of the dacite domes formed the previous summit; another formed Goat Rocks dome on the northern flank. These were destroyed in the eruption of 1980.

Geographic setting and description
Mount St. Helens is located 34 miles (55 km) almost due west of Mount Adams, in the eastern part of the Cascade Range. These "sister and brother" volcanic mountains are each about 50 miles (80 km) from Mount Rainier, the giant of Cascade volcanoes. Mount Hood, the nearest major volcanic peak in Oregon, is about 60 miles (95 km) southeast of Mount St. Helens.

Mount St. Helens is geologically young compared to the other major Cascade volcanoes. It was formed only within the last 40,000 years, and the pre-1980 summit cone started to grow only about 2,200 years ago. The volcano has also been the most active in the Cascades during the Holocene (the last 10,000 or so years).[3]

Even before its loss of height, Mount St. Helens was not one of the highest peaks in the Cascade Range; its summit altitude made it only the fifth-highest peak in Washington. It stood out prominently, however, from surrounding hills because of the symmetry and extensive snow- and ice-cover of the pre-1980 summit cone, earning it the nickname, "Fujiyama of America" ("Mount Fuji of America").[4] The peak rose more than 5,000 feet (1,500 m) above its base, where the lower flanks merge with adjacent ridges. The mountain is about 6 miles (9.5 km) across at its base, which is at an altitude of about 4,400 feet (1,340 m) on the northeastern side and about 4,000 feet (1,220 m) elsewhere. At the pre-eruption tree-line the width of the cone was about 4 miles (6.4 km).

Streams that start on the volcano enter three main river systems: the Toutle River on the north and north-west, the Kalama River on the west, and the Lewis River on the south and east. The streams are fed by abundant rain and snow. The average annual rainfall is 140 inches (3.6 m), and the snowpack on the mountain's upper slopes can reach 16 feet (4.9 m).[5] The Lewis River is impounded by three dams for hydroelectric power generation. The southern and eastern sides of the volcano drain into an upstream impoundment, the Swift Reservoir, which is directly south of the volcano's peak.

Although Mount St. Helens is in Skamania County, Washington, the best access routes to the mountain run through Cowlitz County, Washington on the west. Washington State Route 504, locally known as the Spirit Lake Memorial Highway, connects with the heavily traveled Interstate 5 at Exit 49, about 34 miles (55 km) to the west of the mountain. That major north-south highway skirts the low-lying cities of Castle Rock, Longview and Kelso along the Cowlitz River, and passes through the Vancouver, Washington-Portland, Oregon metropolitan area less than 50 miles (80 km) to the southwest. The community nearest the volcano is Cougar, Washington, in the Lewis River valley about 11 miles (18 km) south-southwest of the peak. Gifford Pinchot National Forest surrounds Mount St. Helens.

You could get more information from the link below...

2006-12-04 21:42:09 · answer #3 · answered by catzpaw 6 · 0 0

Washington, U.S.

2006-12-04 11:21:38 · answer #4 · answered by Anonymous · 0 0

mt.st Helen's is in Alaska.

2006-12-04 12:22:01 · answer #5 · answered by cesar 1 · 0 1

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