A 17-minute steam and ash eruption Jan. 16 destroyed a pair of instruments that scientists had placed on and near the new lava dome on Jan. 14. Scientists this week said they had calculated the new magma-driven uplift of rock, glacial ice and lava to be 44 million cubic yards in mass more than a third the size of the lava dome that took six years to ooze from the crater's surface in the 1980s. A lava cap sitting atop the entire uplift now measures about 1,500 feet north to south, 1,300 feet east to west and more than 400 feet vertically.
Hazard status: Alert Level 2, second on a three-point scale.
Closures: The U.S. Forest Service prohibits public access in a five-mile radius around the volcano. At Coldwater Ridge, the visitors center is open 10 a.m. to 4 p.m. Thursdays through Mondays. The Mount St. Helens Visitor Center at Silver Lake is open 9 a.m. to 4 p.m. daily. Major road closures include state Highway 504 at the Coldwater Ridge Visitor Center and Forest Road 99 at the Wakepish Sno-Park. A complete list of all road and trail closures is available by visiting the Gifford Pinchot National Forest's Web site at www.fs.fed.us/gpnf/.