Siyeh Glacier is in Glacier National Park in the U.S. state of Montana. The glacier lies in a deep cirque to the north of Mount Siyeh at an elevation between and above sea level. Siyeh Glacier covers an area of less than and does not meet the threshold of often cited as being the minimum size to qualify as an active glacier. Siyeh Glacier has experienced massive retreat, losing over 73 percent of its surface area between 1966 and 2005. References See also List of glaciers in the United States Glaciers in Glacier National Park (U.S.) Glaciers of Glacier County, Montana Glaciers of Glacier National Park (U.S.) Glaciers of Montana