Nearly four decades after Mt. St. Helens erupted, a resort in the blast zone faces a different kind of danger

[LA Times] When Mt. St. Helens erupted in 1980, killing 57 people, destroying homes, evaporating lakes and rearranging landmarks, Mark Smith and his family were thankful to have survived.
Their lakeside resort did not. The blast blew away the top 1,300 feet of the mountain, burying nearby Spirit Lake Lodge under at least 300 feet of mud and debris.
Smith, who was 20 years old at the time, watched the destruction from afar with his family. “It was exciting,” he told a reporter back then, before realizing that everything was gone.
He returned to the mountain in 1992 to start a tour company and three years later built the Eco Park Resort on 80 acres in the old blast zone.
Now the new resort is under threat too.
The problem is Spirit Lake. Buried in the eruption, it reformed 200 feet higher and much larger than before, and without any natural drainage. The lake could push through the ash, rock and soil around it — especially in the event of a major earthquake — threatening highways and bridges and 50,000 residents below with catastrophic flooding, according to a recent report commissioned by the U.S. Forest Service.
The 250-page study, conducted by the National Academies of Sciences, Engineering, and Medicine, concluded that the chances of a breach were “relatively low” but that the potential consequences were so severe that costly protective measures deserved serious consideration.
Far more likely is chronic flooding along the Toutle and Cowlitz rivers caused by a steady flow of sediment, the study found.
The eruption of Mt. St. Helens is best known for its immediate impacts: thousands of trees obliterated; an ash cloud that darkened the skies of 11 states; and tens of thousands of elk, deer, hares and bears killed.
Tall forest, blue lakes, birds and other wildlife have since returned to the mountain, which now stands 8,363 feet above sea level. In 1982, Congress designated the 110,000-acre Mt. St. Helens National Volcanic Monument for research, education and recreation. More than a million people visit each year to see the blast zone, some of them staying at Eco Park, which Smith runs with his wife.
But the rearrangement of the landscape has caused some long-term problems.
In 1985, the government provided some drainage for Spirit Lake by boring an 11-foot-wide overflow tunnel through 1.6 miles of rock.
A dam more than 180 feet high and 1,800 feet across was built on the north fork of the Toutle River in 1989 to trap sediment washed down from the mountain.
But those attempts to control nature with engineering have their limits.
The tunnel has required millions of dollars in emergency repairs over the last several years to prevent it from collapsing. The sediment dam has been nearing its capacity, allowing more sediment to get through and clog the rivers. The government spends millions of dollars a year dredging the riverbeds to prevent flooding. Read More

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