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Diamond Peak

Shield Volcano on Diamond Peak Trail in Deschutes NF, Diamond Peak Wilderness, Cascade Range near McCredie Springs, OR

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Diamond Peak is a shield volcano in southwest Oregon and is part of the Cascade Range. The mountain is located near Willamette Pass in the Diamond Peak Wilderness within the Willamette National Forest. Composed of 15 cubic kilometres (3.6 cu mi) of basaltic andesite, the volcano is older than the last ice age but probably younger than 100,000 years. It first began erupting from its northern summit and then from a new vent a little to the south, which is now the primary peak. The mountain has several cirques from glacial erosion. It lies directly on the Cascade Crest and therefore receives a heavy snow pack. Snow fields on the northern side may have been glaciers as recently as 100 years ago.

Classified As

Shield Volcano

Geologic Formation

Mafic vent complexes (ORQTmv;0)

Geologic Formation