The Cowlitz Glacier is on the southeast flank of Mount Rainier in the U.S. state of Washington. The body of ice covers and has a volume of 6 billion ft³ (170 million m³). The glacier starts at an elevation of and flows southeast. An adjacent glacier, the Paradise Glacier, is connected to this glacier on its southwest margin. As it flows down the slopes of Mount Rainier it nearly meets up with the Ingraham Glacier and during the Little Ice Age, which ended around the year 1850, the two glaciers shared a common terminus. Meltwater from the glacier drains into the Cowlitz River.