"by a small tremor that lasted nearly ninety minutes, and a magnitude 2.7 earthquake. But by the end of January, the lava dome growth had stopped. On July 10, 2008, it was determined that the eruption that began in 2004 had ended, after 6 months of inactivity. 2004–08 volcanic activity of Mount St. Helens The 2004–2008 volcanic activity of Mount St. Helens, Washington, United States has been documented as a continuous eruption in the form of gradual extrusion of magma. Starting in October 2004 and ceasing in January 2008, a new lava dome was built up. The new dome did"
"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. Sightly is located at (46.2998338, -122.7084437). Sightly, Washington Sightly is an unincorporated community in Cowlitz County, Washington. Sightly is located east of the city of Castle Rock and east of Silver Lake. Sightly is reached by taking exit 49 off of Interstate 5, traveling east along Washington State Route 504, which is also known as the Spirit Lake Memorial Highway, and then traveling along Sightly Road. The Sightly community was given its"
"St. Helens on May 18, 1980 was the deadliest and most economically destructive volcanic event in the history of the United States. For many years climbers attempting to scale Mount St. Helens registered at Jack's Store until it burned down in December 2007. Yale has several view locations for Mount Saint Helens. Yale is located at (45.9953885, -122.3800979). Yale, Washington Yale is an unincorporated community in Cowlitz County, Washington, northeast of the city of Woodland. Yale is located northeast of Woodland along Washington State Route 503 and situated between Yale Lake and Lake Merwin, both reservoirs on the Lewis River."
"1980 eruption. Mount St. Helens is west of Mount Adams, in the western part of the Cascade Range. These ""sister and brother"" volcanic mountains are approximately from Mount Rainier, the highest of Cascade volcanoes. Mount Hood, the nearest major volcanic peak in Oregon, is 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 pre-1980 summit cone began rising about 2,200 years ago. The volcano is considered the most active in the Cascades within the Holocene epoch (the last 10,000 or so"
"St. Helens, a highly active volcano northeast of the city in Washington state, is easily visible on clear days and is close enough to have dusted the city with volcanic ash after its eruption on May 18, 1980. The rocks of the Portland area range in age from late Eocene to more recent eras. Multiple shallow, active fault lines traverse the Portland metropolitan area. Among them are the Portland Hills Fault on the city's west side, and the East Bank Fault on the east side. According to a 2017 survey, several of these faults were characterized as ""probably more of"
"observed. Hayes Volcano Hayes Volcano is a stratovolcano in southwestern Matanuska-Susitna Borough, Alaska, 135 km northwest of Anchorage, that was not discovered until 1975. It is responsible for a series of six major tephra layers in the Cook Inlet region of Alaska. Hayes was mostly destroyed by at least six catastrophic eruptions between 3,400 and 3,800 years ago, and the average volume of these eruptions was 2.4 cubic km. In comparison, the volume of the May 18, 1980 eruption of Mount St. Helens was about 1 cubic km. The eruptions of Hayes Volcano during that time were the most voluminous"
"Hayes Volcano Hayes Volcano is a stratovolcano in southwestern Matanuska-Susitna Borough, Alaska, 135 km northwest of Anchorage, that was not discovered until 1975. It is responsible for a series of six major tephra layers in the Cook Inlet region of Alaska. Hayes was mostly destroyed by at least six catastrophic eruptions between 3,400 and 3,800 years ago, and the average volume of these eruptions was 2.4 cubic km. In comparison, the volume of the May 18, 1980 eruption of Mount St. Helens was about 1 cubic km. The eruptions of Hayes Volcano during that time were the most voluminous Holocene"
"peak in the contiguous 48 states, is in the Sierra Nevada. The Cascades are also volcanic. Mount Rainier, a volcano in Washington, is also over . Mount St. Helens, a volcano in the Cascades erupted explosively in 1980. A major volcanic eruption at Mount Mazama around 4860 BC formed Crater Lake. These mountain ranges see heavy precipitation, capturing most of the moisture that remains after the Coast Ranges, and creating a rain shadow to the east forming vast stretches of arid land. These dry areas encompass much of Nevada, Utah, and Arizona. The Mojave Desert and Sonoran Desert along with"
"(45.9903884, -122.4756559). Woodland Park, Washington Woodland Park is an unincorporated community in Cowlitz County, Washington. The Woodland Park community is located northeast of Woodland along Washington State Route 503 and on the north shore of Lake Merwin, a reservoir on the Lewis River. The Woodland Park community is part of the Woodland School District, a K-12 school district of about 2,200 students. Woodland Park is located southwest 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. Woodland Park is"
"Crater Glacier The Crater Glacier (also known as Tulutson Glacier) is a geologically young glacier that is located on Mount St. Helens, in the U.S. state of Washington. The glacier formed after the 1980 Eruption and due to its location, the body of ice grew rapidly, unknown to the public for nearly 20 years. The glacier once contained ice caves in the smooth ice before the 2004-2008 volcanic activity. The growth of the lava dome and volcanic eruptions from 2004 to 2008 significantly altered the appearance of the glacier. In the same time period, several agencies decided to put an"
"Pigeon Springs, Washington Pigeon Springs is an unincorporated community in Cowlitz County, Washington. Pigeon Springs is located east of the city of Kalama and along the Kalama River. Pigeon Springs is reached by traveling east on Kalama River Road from exit 32 of Interstate 5. The Pigeon Springs community is part of the Kalama School District, a K-12 school district of about 900 students. Pigeon Springs is located southwest 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 and"
"States of America. A total of 57 people are known to have died, and more were left homeless when the ash falls and pyroclastic flows destroyed or buried 200 houses. In addition to the human fatalities, thousands of animals perished. The official estimate from the USGS was 7,000 game animals, salmon fingerlings, and 40,000 salmon. Two years after the eruption, the United States government set aside of land for the Mount St. Helens National Volcanic Monument. This protected area, which includes the Johnston Ridge Observatory and several other research and visitor centers, serves as an area for scientific research, tourism,"
"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 notorious for its major 1980 eruption, the deadliest and most economically destructive volcanic event in the history of the United States. Fifty-seven people were killed; 250 homes, 47 bridges, of railways, and of highway were destroyed. A massive debris avalanche triggered by an earthquake measuring 5.1 on the Richter scale caused an eruption that reduced the elevation of the mountain's summit from to , leaving a wide horseshoe-shaped crater. The debris"
"St. Helens National Volcanic Monument at , at 2,440 feet. Lava Canyon Falls Lava Canyon Falls drops 200 feet (61 meters) along the Muddy River in Skamania County, Washington. Lava Canyon Falls was formed by the 1980 eruption of Mt. St. Helens, which caused a lahar and flood which scoured out a canyon that had been filled with dirt and mud for 1,800 years. The Muddy River's course was redirected to that canyon as a result of the lahar and the floods, and it drops 1,400 feet (426 meters) in 2 miles (3.2 km). Lava Canyon Falls is the largest,"
"thousands of animals were killed, and Mount St. Helens was left with a crater on its north side. At the time of the eruption, the summit of the volcano was owned by the Burlington Northern Railroad, but afterward the land passed to the United States Forest Service. The area was later preserved, as it was, in the Mount St. Helens National Volcanic Monument. Mount St. Helens remained dormant from its last period of activity in the 1840s and 1850s until March 1980. Several small earthquakes, beginning on March 15, indicated that magma may have begun moving below the volcano. On"
"photographers from the ""Miami Herald"" won a Pulitzer Prize for photographing the effects of the lahar. Dr. Stanley Williams of Louisiana State University said that following the eruption, ""With the possible exception of Mount St. Helens in the state of Washington, no other volcano in the Western Hemisphere is being watched so elaborately."" In response to the eruption, the USGS Volcano Crisis Assistance Team was formed in 1986, and the Volcano Disaster Assistance Program. The volcano erupted several more times between 1985 and 1994. Concerns over the alleged negligence of local officials to alert locals of the volcano's threat led"
"in the contiguous United States. The early eruptive stages of Mount St. Helens are known as the ""Ape Canyon Stage"" (around 40,000–35,000 years ago), the ""Cougar Stage"" (ca. 20,000–18,000 years ago), and the ""Swift Creek Stage"" (roughly 13,000–8,000 years ago). The modern period, since about 2500 BCE, is called the ""Spirit Lake Stage"". Collectively, the pre–Spirit Lake stages are known as the ""ancestral stages"". The ancestral and modern stages differ primarily in the composition of the erupted lavas; ancestral lavas consisted of a characteristic mixture of dacite and andesite, while modern lava is very diverse (ranging from olivine basalt to"
"the flows are being eroded by local streams. The lava dome likely formed before the lava flows erupted. West Crater lies in Skamania County, in the U. S. state of Washington. It reaches an elevation of . The volcano was registered with the United States Geographic Names Information System in 1979. West Crater and the rest of the Marble Mountain-Trout Creek Hill field can be accessed by roads in the Gifford Pinchot National Forest and Mount St. Helens National Volcanic Monument. Washington Route 503 and Forest Service Route 90 lie to the east of Woodland. West Crater can be accessed"
"Mount St. Helens in 1980. It is also the site of Canada's most recent major eruption about 2,350 years ago at the Mount Meager massif. The Cascade Arc includes nearly 20 major volcanoes, among a total of over 4,000 separate volcanic vents including numerous stratovolcanoes, shield volcanoes, lava domes, and cinder cones, along with a few isolated examples of rarer volcanic forms such as tuyas. Volcanism in the arc began about 37 million years ago; however, most of the present-day Cascade volcanoes are less than 2,000,000 years old, and the highest peaks are less than 100,000 years old. Twelve volcanoes"
"(10,000 ft) in elevation. The major peaks from south to north include: The most active volcanoes in the chain include Mount St. Helens, Mt. Baker, Lassen Peak, and Mt. Hood. St. Helens captured worldwide attention when it erupted catastrophically in 1980. St. Helens continues to rumble, albeit more quietly, emitting occasional steam plumes and experiencing small earthquakes, both signs of continuing magmatic activity. Most of the volcanoes have a main, central vent from which the most recent eruptions have occurred. The peaks are composed of layers of solidified andesitic to dacitic magma, and the more siliceous (and explosive) rhyolite. The"
"Woodland Park, Washington Woodland Park is an unincorporated community in Cowlitz County, Washington. The Woodland Park community is located northeast of Woodland along Washington State Route 503 and on the north shore of Lake Merwin, a reservoir on the Lewis River. The Woodland Park community is part of the Woodland School District, a K-12 school district of about 2,200 students. Woodland Park is located southwest 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. Woodland Park is located at"
"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. Toutle is a rural community at the foot of Mt. St. Helens. Toutle, Washington Toutle is an unincorporated community in Cowlitz County, Washington. Toutle is located east of Castle Rock along Washington State Route 504, which is also known as the Spirit Lake Memorial Highway. The Toutle community, similar to Toutle River, takes its name from the ""Hullooetell"", a band of the Skillot - a Chinookan tribe. The Toutle community is part of the Toutle"
"miles downwind, and drifting clouds of fine ash can cause severe damage to jet aircraft even thousands of miles away. All of the known historical eruptions have occurred in Washington, Oregon and in Northern California. The two most recent were Lassen Peak in 1914 to 1921 and a major eruption of Mount St. Helens in 1980. Minor eruptions of Mount St. Helens have also occurred, most recently in 2006. In contrast, volcanoes in southern British Columbia, central and southern Oregon are currently dormant. The regions lacking new eruptions keep in touch to positions of fracture zones that offset the Gorda"
"Indian Heaven Indian Heaven is a volcanic field in Skamania County in the state of Washington, in the United States. Midway between Mount St. Helens and Mount Adams, the field dates from the Pleistocene to the early Holocene epoch. It trends north to south and is dominated by six small shield volcanoes; these shields are topped by small spatter and cinder cones, and the field includes a number of subglacial volcanoes and tuyas. The northernmost peak in the field is Sawtooth Mountain and the southernmost is Red Mountain; its highest point is Lemei Rock at an elevation of . Indian"
"Mount Saint Helena 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"
"journey westward down the Columbia, the Lewis and Clark Expedition recorded seeing the mountain; noting that it was ""a high mountain of emence hight covered with snow"" and thought it ""perhaps the highest pinnacle in America."" They initially misidentified it as Mount St. Helens, which had been previously discovered and named by George Vancouver. On the return journey in 1806, they recorded seeing both, but did not give Adams a name, only calling it ""a very high humped mountain"". This is the earliest recorded sighting of the volcano by European explorers. For several decades after Lewis and Clark sighted the"
"the wilderness near Mount St. Helens, a stratovolcano located in Skamania County, Washington. He settled at the foot of the mountain and opened a gas station and a grocery store; he eventually opened the Mount St. Helens Lodge, close to the outlet of Spirit Lake, which he operated for 52 years. During the 1930s, Truman divorced his wife; he remarried in 1935. The second marriage was short, as he reportedly attempted to win arguments by throwing his wife into Spirit Lake, despite her inability to swim. He began dating a local girl, though he eventually married her sister Edna, whom"
"later by National Guard helicopter pilots. Their film, ""The Eruption of Mount St. Helens"", later became a popular documentary. In 1982, President Ronald Reagan and the U.S. Congress established the Mount St. Helens National Volcanic Monument, a area around the mountain and within the Gifford Pinchot National Forest. Following the 1980 eruption, the area was left to gradually return to its natural state. In 1987, the U.S. Forest Service reopened the mountain to climbing. It remained open until 2004 when renewed activity caused the closure of the area around the mountain (see ""Geological history"" section above for more details). Most"
"caused by an injection of magma at shallow depth below the mountain that created a huge bulge and a fracture system on Mount St. Helens' north slope. An earthquake at 8:32 am on May 18, 1980, caused the entire weakened north face to slide away, suddenly exposing the partly molten, gas- and steam-rich rock in the volcano to lower pressure. The rock responded by exploding into a very hot mix of pulverized lava and older rock that sped toward Spirit Lake so fast that it quickly passed the avalanching north face. Alaska is known for its seismic and volcanic activity,"
"18, 1980, following a period of heavy tremors and eruptions, the northeast face of Mount St. Helens exploded outward, destroying a large part of the top of the volcano. This eruption flattened the forests for many miles, killed 57 people, flooded the Columbia River and its tributaries with ash and mud and blanketed large parts of Washington in ash, making day look like night. Washington is well known for several prominent companies, the most notable of which are Microsoft, Amazon.com, Boeing, Nordstrom, Bon Marche, Costco, and Starbucks. Monopolies have a long history in the state as Bill Boeing's namesake company"
"damaged over 200 homes, of highway and of railways. Between 1980 and 1986, activity continued at Mount St. Helens, with a new lava dome forming in the crater. Numerous small explosions and dome-building eruptions occurred. From December 7, 1989, to January 6, 1990, and from November 5, 1990, to February 14, 1991, the mountain erupted with sometimes huge clouds of ash. Magma reached the surface of the volcano about October 11, 2004, resulting in the building of a new lava dome on the existing dome's south side. This new dome continued to grow throughout 2005 and into 2006. Several transient"
"Lemei Rock Lemei Rock is a shield volcano, and part of the Indian Heaven polygenetic volcanic field in Washington, United States. It is located midway between Mount St. Helens and Mount Adams, and dates from the Pleistocene and Holocene. Lemei Rock is the highest point at . Lemei Rock is the highest peak the Indian Heaven Wilderness in Washington and the Cascade Range. Lemei Rock has a topographic prominence of 2405 ft (733 m). On clear days hikers can see views of four nearby volcanoes: Mount Adams, Mount Hood, Mount St. Helens, and Mount Rainier. The shield volcano is topped"
"km) to its northeast. 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. A post office called Cougar was established in 1902. The community was named after the cougar. Cougar is located at (46.0514993, -122.2995413). A notable Cougar resident is Gary Bennett, former Arista Records Recording Artist and founding member of country band, BR549. Cougar, Washington Cougar is an unincorporated community and former town in Cowlitz County, Washington, northeast of the city of Woodland. Cougar is located northeast of Woodland along Washington State"