The Winthrop Glacier is a large glacier on the northeastern side of Mount Rainier in Washington. Starting at over Template:Unit ft at the Columbia Crest, the glacier descends steeply over the uneven topography of Rainier. Another glacier, the Emmons Glacier is directly connected to this glacier up to the Steamboat Prow. After passing the Prow, the glaciers split up; the Emmons heads east-northeastward and the Winthrop continues northeast. As the terrain becomes flatter, the Winthrop glacier becomes heavily rock-covered when it terminates in a forest at about Template:Unit ft.