123

Number of years the mountain lay dormant before its May 1980 eruption

5.1

Magnitude of earthquake that caused the largest landslide in recorded history, which triggered the 1980 eruption

3

Number of minutes it took the blast to flatten 230 square miles of forest

4 billion

Board feet of timber damaged or destroyed by the eruption (enough to build about 500,000 two-bedroom homes)

125 million

Amount, in cubic yards, of lava that erupted from October 2004 to January 2008 (enough to pave a three-foot-thick, seven-lane highway from Portland to New York City)

130

Number of lakes, ponds, and wetlands carved out by the eruption’s landslide

$951

Amount, in millions, that Congress allotted for disaster relief after the eruption

110,000

Acres of land protected by the Mount St. Helens National Volcanic Monument, established by Congress in 1982

200

Projected number of years before the blast zone will begin to resemble pre-eruption, old-growth forest

2.6

Number of distinct eruptive periods over the past 4,000 years (Mount St. Helens is the most active volcano in the Cascade Range)