<P> With the recent volcanic activity starting in 2004 , the glacier lobes were pushed aside and upward by the growth of new volcanic domes . The surface of the glacier , once mostly without crevasses , turned into a chaotic jumble of icefalls heavily criss - crossed with crevasses and seracs caused by movement of the crater floor . The new domes have almost separated the Crater Glacier into an eastern and western lobe . Despite the volcanic activity , the termini of the glacier have still advanced , with a slight advance on the western lobe and a more considerable advance on the more shaded eastern lobe . Due to the advance , two lobes of the glacier joined together in late May 2008 and thus the glacier completely surrounds the lava domes . In addition , since 2004 , new glaciers have formed on the crater wall above Crater Glacier feeding rock and ice onto its surface below ; there are two rock glaciers to the north of the eastern lobe of Crater Glacier . Crater Glacier is the only known advancing glacier in the contiguous United States . </P>
<P> With the recent volcanic activity starting in 2004 , the glacier lobes were pushed aside and upward by the growth of new volcanic domes . The surface of the glacier , once mostly without crevasses , turned into a chaotic jumble of icefalls heavily criss - crossed with crevasses and seracs caused by movement of the crater floor . The new domes have almost separated the Crater Glacier into an eastern and western lobe . Despite the volcanic activity , the termini of the glacier have still advanced , with a slight advance on the western lobe and a more considerable advance on the more shaded eastern lobe . Due to the advance , two lobes of the glacier joined together in late May 2008 and thus the glacier completely surrounds the lava domes . In addition , since 2004 , new glaciers have formed on the crater wall above Crater Glacier feeding rock and ice onto its surface below ; there are two rock glaciers to the north of the eastern lobe of Crater Glacier . Crater Glacier is the only known advancing glacier in the contiguous United States . </P>
when was the last time mount saint helens erupted
when was the last time mount saint helens erupted
2004
2004