[[File:Summit rim of Mount St. Helens.ogv|thumb|220px|Al som del Mont St. Helens]]
Pendent l'ivèrn de 1980–1981, un [[glacièr]] nòu apareguèt. Uèi oficialament nomenat [[Crater Glacier]], èra ancianament conegut jol nom de Tulutson Glacier. Ombratjat per las parets del cratèr e alimentat per las importantas casudas de nèu e avalancas, creissèt rapidament (4.3 m per an). ByEn 2004, itcobrissiá coveredaperaquí about93 {{Convert|0.36|sqmi|km2|2}}, ande wasèra divideddevesit byper thelo domedòma intocentral aen westerndos andlòbes. easternGeneralament lobe.a Typically,la byfin latede summerl'estiu, thelo glacièr es fosc amor glacierde lookslas darkcasudas fromde rockfallròcas fromdel thecratèr cratere wallsde andcendres ashde fromlas eruptionserupcions. As of 2006, the ice had an average thickness of {{Convert|300|ft|m|-2}} and a maximum of {{Convert|650|ft|m|-2}}, nearly as deep as the much older and larger [[Carbon Glacier]] of Mount Rainier. The ice is all post–1980, making the glacier very young geologically. However, the volume of the new glacier is about the same as all the pre–1980 glaciers combined.<ref name="Brugman81">{{cite web | last = Brugman | first = Melinda M. | coauthors = [[Austin Post]] | title = USGS Circular 850-D: Effects of Volcanism on the Glaciers of Mount St. Helens | url= http://pubs.er.usgs.gov/publication/cir850D | year = 1981 | accessdate = 2007-03-07 }}</ref><ref name="Wiggins02" >{{cite journal | last = Wiggins | first = Tracy B. | coauthors = Hansen, Jon D.; Clark, Douglas H. | title = Growth and flow of a new glacier in Mt. St. Helens Crater | journal = Abstracts with Programs - Geological Society of America | volume = 34 | issue = 5 | page = 91 | publisher = | year = 2002 | url = }}</ref><ref name="Schilling04">{{cite journal | last = Schilling | first = Steve P. | coauthors = Paul E. Carrara, Ren A. Thompson, and Eugene Y. Iwatsubo | title = Posteruption glacier development within the crater of Mount St. Helens, Washington, USA | journal = Quaternary Research | volume =61 | issue =3 | pages =325–329 | publisher = Elsevier Science (USA) | year = 2004 | url = | doi = 10.1016/j.yqres.2003.11.002 | bibcode=2004QuRes..61..325S}}</ref><ref>{{cite journal | last = McCandless | first = Melanie | coauthors = Plummer, Mitchell; Clark, Douglas | title = Predictions of the growth and steady-state form of the Mount St. Helens Crater Glacier using a 2-D glacier model | journal = Abstracts with Programs - Geological Society of America | volume = 37 | issue = 7 | page = 354 | publisher = | year = 2005 | url = }}</ref><ref>{{cite web | last = Schilling | first = Steve P. | coauthors = David W. Ramsey, James A. Messerich, and Ren A. Thompson | title = USGS Scientific Investigations Map 2928: Rebuilding Mount St. Helens | url= http://pubs.usgs.gov/sim/2006/2928/ | date = 2006-08-08 | accessdate = 2007-03-07 }}</ref>
