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Mount Iliamna
View of the glaciated north flank of Iliamna Volcano. A plume of steam and gas typically rises several hundred meters above the fumarole field.
Highest point
Elevation 10,016 ft (3,053 m)
Prominence 7,867 ft (2,398 m)
  • North America prominent 44th
Location Lake Clark National Park and Preserve, Kenai Peninsula Borough, Alaska, US
Parent range Chigmit Mountains, Aleutian Range
Topo map USGS Lake Clark A-1
Mountain type Stratovolcano
Volcanic arc/belt Aleutian Arc
Last eruption 1876
First ascent 1959
Designated: 1976

Mount Iliamna (Dena'ina: Ch’naqał’in) is a glacier-covered stratovolcano in the largely volcanic Aleutian Range in southwest Alaska. Located in the Chigmit Mountain subrange in Lake Clark National Park and Preserve, the 10,016-foot (3,053 m) volcano lies approximately 134 miles (215 km) southwest of Anchorage on the west side of lower Cook Inlet. It is the 25th most prominent peak in the United States.

Mount Iliamna in July 2015
Mount Iliamna of the Aleutian Range, July 2015.

The volcano's glaciers have extensively altered its profile, cutting, deep and creating steep cliffs and cirques. A ridge extends 5 kilometres (3.1 mi) south from the main body of the mountain, with North Twin and South Twin peaks along its length. There is no summit crater, only a zone of fumaroles just south of the summit at the top of large collapse zone at the head of Red Glacier, which exposes a cross section of the mountain.

Holocene eruptive activity from Iliamna is little known, but radiocarbon dating seems to indicate at least a few eruptions, all before the European settlement of Alaska. Prehistoric eruptions have been dated to 5050 and 2050 BCE (VEI 4), 450 BCE, 1650, 1867 (VEI 2) and 1876 (VEI 3). Fumaroles located at about 8,990 feet (2,740 m) elevation on the eastern flank produce nearly constant plumes of steam and minor amounts of sulfurous gases. These plumes are quite vigorous and have resulted in numerous pilot reports and early historical accounts of "eruptions" at Iliamna Volcano. Earthquake swarms and elevated seismicity and gas emissions were reported in 1996-97 and 2011–13. Iliamna was ranked as a high-threat volcano by the U.S. Geological Survey in 2005 and 2018. The 2018 assessment ranked Iliamna as the 20th most hazardous volcano in the United States, up from 22nd, with an aviation threat score of 34 and an overall score of 115, the second highest of the "high threat" category.

Major glaciers associated with Iliamna are Red Glacier, Tuxedni Glacier, Lateral Glacier and Umbrella Glacier.

Iliamna was first ascended in 1959. It was designated a National Natural Landmark in 1976.

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