What is the largest glacier by area in the contiguous United States found on Mount Rainier?

Emmons Glacier is recognized as the largest glacier by area in the contiguous United States, located on the northeastern flank of Mount Rainier in Washington State. Covering approximately 3.5 square miles, Emmons Glacier is significant not only for its size but also for its stunning glacial features and role in the hydrology of the Mount Rainier National Park ecosystem.

The glacier is named after Thompson Emmons, a member of the first successful ascent of Mount Rainier in 1870. Due to its large surface area, Emmons Glacier serves as an important site for scientific research related to climate change and glacial retreat, as it is one of the more accessible glaciers in the continental U.S.

Other glaciers mentioned may have distinct characteristics or smaller sizes. Agua Glacier and David Glacier, while notable, do not match Emmons in area or prominence. North Cascade Glacier is likewise smaller compared to Emmons and located in a different mountain range, specifically in the North Cascades region, rather than on Mount Rainier. This context helps highlight why Emmons Glacier holds the title of the largest glacier by area in the contiguous United States.