Redoubt is the park 's active volcano . high , about in diameter and with a volume of about 30 to 35 cubic kilometers , the stratovolcano rises through the Chigmit batholith . It has a wide summit crater . The Drift Glacier originates there and flows through a gap in the rim . Redoubt 's most recent active phase began on December 14 , 1989 , with ash eruptions . The ash clouds affected air traffic , causing all four engines to fail on KLM Flight 867 when it passed overhead at . The 747 was able to safely return to Anchorage . Four other airplanes were damaged in the same event , which brought greater awareness of the hazards associated with high-altitude volcanic ash . Redoubt was quiet after 1990 until March and April 2009 when it erupted with pyroclastic flows that melted ice , creating lahars on the Drift River , endangering the Drift River Terminal Facility to the east of the park
erupted
2009 Mount Redoubt eruptive activity
Lake Clark National Park and Preserve