About 35,000 years ago, the Ingraham and Cowlitz glaciers flowed down from Mount Rainier to near present-day Mossyrock, Washington. More recently, the Cowlitz - Ingraham glaciers advanced slightly from the mid-1970s to mid-1980s, but have been in a general state of retreat since the end of the Little Ice Age around the year 1850. During the Little Ice Age, the Ingraham and Cowlitz glaciers were combined and terminated at the level but have retreated more than in the last 150 years.