Mount Griggs, formerly known as Knife Peak Volcano, is a stratovolcano, which lies 10 km behind the volcanic arc defined by other Katmai group volcanoes. Although no historic eruptions have been reported from Mount Griggs, vigorously active fumaroles persist in a summit crater and along the upper southwest flank. The fumaroles on the southwest flank are the hottest, and some of the flank fumaroles can roar so loudly that they can be heard from the valley floor. The slopes of Mount Griggs are heavily mantled by fallout from the 1912 eruption of Novarupta volcano.
The mountain was named for Dr. Robert Fiske Griggs (1881–1962), botanist, whose explorations of the area, after the eruption of Mount Katmai in 1912, led to the creation of Katmai National Monument by President Woodrow Wilson in 1918.
By elevation Mount Griggs is
# 4 out of 90 in Lake and Peninsula # 1 out of 41 in Katmai National Park # 5 out of 297 in the Aleutian Range
By prominence Mount Griggs is
# 22 out of 3806 in Alaska # 37 out of 91437 in USA # 3 out of 90 in Lake and Peninsula # 1 out of 41 in Katmai National Park # 4 out of 297 in the Aleutian Range
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