Title: Mount St. Helens
Content:  Mount St. Helens (known as Lawetlat'la to the Indigenous Cowlitz people, and Loowit or Louwala-Clough to the Klickitat) is an active stratovolcano located in Skamania County, Washington in the Pacific Northwest region of the United States. It lies 83 km northeast of Portland, Oregon and 158 km south of Seattle. Mount St. Helens takes its English name from the British diplomat Lord St Helens, a friend of explorer George Vancouver who surveyed the area in the late 18th century. The volcano is part of the Cascade Volcanic Arc, a segment of the Pacific Ring of Fire. Mount St. Helens is best known for its major eruption on May 18, 1980, the deadliest and most economically destructive volcanic event in U.S. history. Fifty-seven people were killed; 200 homes, 47 bridges, 15 mi of railways, and 185 mi of highway were destroyed. A massive debris avalanche, triggered by a magnitude 
Title: Mount St. Helens
Content:  Mount St. Helens is 34 mi west of Mount Adams, in the western part of the Cascade Range. Considered "brother and sister" mountains, the two volcanoes are approximately 50 mi from Mount Rainier, the highest of the Cascade volcanoes. Mount Hood, the nearest major volcanic peak in Oregon, is 60 mi southeast of Mount St. Helens. Mount St. Helens is geologically young compared with the other major Cascade volcanoes. It formed only within the past 40,000 years, and the summit cone present before its 1980 eruption began rising about 2,200 years ago. The volcano is considered the most active in the Cascades within the Holocene epoch, 
Title: Saint Helens, Washington
Content:  Saint Helens is an unincorporated community in Cowlitz County, Washington. Saint Helens is located east of the city of Castle Rock and along the North Fork Toutle River. Saint Helens is reached by traveling 24 mi east of Castle Rock along Washington State Route 504, which is also known as the Spirit Lake Memorial Highway. The Saint Helens community takes its name from Mount St. Helens, which, in turn, was named by explorer George Vancouver after a friend of his, Baron St. Helens. The Saint Helens community is part of the Toutle Lake School District, a K-12 school district of about 600 students. Saint Helens is located 19.15 mi northwest of Mount St. Helens. The eruption of Mount St. Helens on May 18, 1980, was the deadliest and most economically destructive volcanic event in the history of the United States.
Title: Mount Saint Helena
Content:  Mount Saint Helena (Wappo: Kanamota, "Human Mountain") is a peak in the Mayacamas Mountains with flanks in Napa, Sonoma, and Lake counties of California. Composed of uplifted 2.4-million-year-old volcanic rocks from the Clear Lake Volcanic Field, it is one of the few mountains in the San Francisco Bay Area to receive any snowfall during the winter. The mountain has five peaks, arranged in a rough "M" shape. Its highest point, North Peak, is in Sonoma County. The second-tallest, immediately east of the main summit, is the highest point in Napa County. The headwaters of the Napa River arise on the southeast slope of Mount Saint Helena.
Title: Mount St. Helens National Volcanic Monument
Content:  Mount St. Helens National Volcanic Monument is a U.S. National Monument that includes the area around Mount St. Helens in Washington. It was established on August 27, 1982, by U.S. President Ronald Reagan, following the 1980 eruption. The 110,000 acre (445 km2) National Volcanic Monument was set aside for research, recreation, and education. Inside the monument, the environment is left to respond naturally to the disturbance. It was the third national monument to be managed by the U.S. Forest Service. At dedication ceremonies on May 18, 1983, Max Peterson, head of the USFS, said, "we can take pride in having preserved the unique episode of natural history for future generations." Since then, many trails, viewpoints, information stations, campgrounds, and picnic areas have been established to accommodate the increasing number of visitors each year. Beginning in 1983, visitors have been able to drive to Windy Ridge, only 4 mi northeast of the crater. Mountain climbing to the summit of the volcano has been allowed since 1986.
Title: Mount St. Helens
Content:  In its undisturbed state, the slopes of Mount St. Helens lie in the Western Cascades Montane Highlands ecoregion. This ecoregion has abundant precipitation: an average of 2373 mm of precipitation falls each year at Spirit Lake. This precipitation supported dense forest up to 1600 m, with western hemlock, Douglas-fir, and western redcedar. Above this, this forest was dominated by Pacific silver fir up to 1300 m. Finally, below treeline, the forest consisted of mountain hemlock, Pacific silver fir and Alaska yellow cedar. Large mammals included Roosevelt elk, black-tailed deer, American black bear, and mountain lion. Treeline at Mount St Helens was unusually low, at about 1340 m. This was due to prior volcanic disturbance of the forest: the treeline was thought to be moving up the slopes before the eruption. Alpine meadows were uncommon at Mount St Helens. Mountain goats inhabited higher elevations of the peak, although they were wiped out in the 1980 eruption.
Title: Mount St. Helens
Content:  Mount St. Helens is a popular climbing destination for both beginning and experienced mountaineers. The peak is climbed year-round, although it is more often climbed from late spring through early fall. All routes include sections of steep, rugged terrain. A permit system has been in place for climbers since 1987. A climbing permit is required year-round for anyone who will be above 4800 ft on the slopes of Mount St. Helens. The standard hiking/mountaineering route in the warmer months is the Monitor Ridge Route, which starts at the Climbers Bivouac. This is the most popular and crowded route to the summit in the summer and gains about 4600 ft in approximately 5 mi to reach the crater rim. Although strenuous, it is considered a non-technical climb that involves 
Title: Mount Henkel
Content:  Mount Henkel (8774 ft) is located in the Lewis Range, Glacier National Park in the U.S. state of Montana. Kennedy Lake is just to the north of the mountain.
Title: Mount St. Helens
Content:  Streams that originate on the volcano enter three main river systems: The Toutle River on the north and northwest, 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 in, and the snowpack on the mountain's upper slopes can reach 16 ft. 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 
Title: Mount St. Helens
Content:  earthquake, caused a lateral eruption that reduced the elevation of the mountain's summit from 9677 ft to 8363 ft, leaving a 1 mi wide, horseshoe-shaped crater. The debris avalanche was 2.5 km3 in volume. The 1980 eruption disrupted terrestrial ecosystems near the volcano. By contrast, aquatic ecosystems in the area greatly benefited from the amounts of ash, allowing life to multiply rapidly. By six years after the eruption, most lakes in the area returned to their normal state. After its 1980 eruption, the volcano had continuous volcanic activity until 2008. Geologists predict that future eruptions will be more destructive, since the configuration of the lava domes there require more pressure to erupt. Despite this, Mount St Helens is a popular hiking spot, and it is climbed year-round. In 1982, the Mount St. Helens National Volcanic Monument was established by U.S President Ronald Reagan and the U.S Congress.

Question: where is mount st helens volcano?
Answer: Skamania County.