Mount Griggs

Mount Griggs is a stratovolcano in Katmai National Park in southern Alaska, part of the Katmai volcanic cluster but set slightly behind its main arc. Though no historic eruptions are known, it remains visibly active through persistent fumaroles in its summit crater and on its upper southwest flank, some audible from the valley floor. Its summit is unusually complex, with three concentric craters and a recent cone topped by two more craters. Ash from Novarupta’s 1912 eruption heavily blankets its slopes. Named for botanist Robert Fiske Griggs, it is also tied to the explorations that helped inspire creation of Katmai National Monument in 1918.

King Salmon, Alaska · United States