A raft of dead trees floats across Spirit Lake. The family who owned the popular Spirit Lake Lodge say they’ll never forget where they were on May 18, 1980, when they found out the lodge was gone. The eruption left 57 people dead and caused $1 billion in damages. Logs in Spirit Lake after the volcanic eruption On March 19, 1982, almost two years after the initial eruption, Mt. (AP Photo/Barry Sweet) AP FILE Pumice covered a six-square-mile area in front of the mountain—the Pumice Plain—to a depth of 120 feet, while Spirit Lake became a black cesspool of logs, pumice and ash. Photo credit. The removal and virtual vaporization of forest vegetation by the blast caused great changes in the physical and chemical structure of lakes within the blast zone. A road through the blast zone. High-altitude color-infrared photographs of the Mount St. Helens region "before" and "after" the eruption of May 18, 1980. The cataclysmic eruption remade the famous Spirit Lake by lifting the lake bed 200 feet higher and dumping debris in its wake that continues to act as a giant dam - … Prior to the eruption, Spirit Lake and other lakes were typical cold, clear mountain lakes (low nutrients, productivity and temperature with high clarity). Post-eruption, Spirit Lake Lodge lay hundreds of feet underground. The fish in Spirit Lake, north of Mount St. Helens, all perished during the eruption, and so much volcanic debris slid into the lake that its bottom was raised 200 feet (60 m). Skip Navigation. Photo credit. St. Helens again had a major eruption which not only blasted ash and rock outward, but also melted loads of snow in the crater and on the sides of the mountain, which caused a huge mudflow to travel downslope . The debris avalanche that swept down the Toutle River during the May 18, 1980 eruption of Mount St. Helens blocked South Fork Castle Creek. Photo credit. Share on Facebook; St. Helens in Washington State, USA. After the eruption, the lake bottom was almost 200 feet higher than it had been. Castle Lake. After the 1980 eruption, Spirit Lake was “was left a steaming black broth full of logs, dead animals, pumice and ash. Photo credit. Picture taken in 2009. Spirit Lake on the slopes of Mt. The debris was transported along with the water as it returned to its basin, raising the surface level of Spirit Lake by about 200 ft (61 m). Volcanic mudflows (lahars) poured down rivers and gullies around the intact flanks. Photo credit. Note the changes in the shoreline of Spirit Lake (upper right corner). George Barker, of the Skamania County Sheriff Dept., tells residents of homes at Spirit Lake that the road was closed due to earthquakes on nearby Mount St. Helens, March 26, 1980. This photo was taken two years after the eruption and shows the ruined lake filled with debris from the eruption. 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