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Three Sisters

Trio of Volcanic Peaks in the Cascades

Stratovolcano in Willamette NF, Three Sisters Wilderness, Cascade Range near Sisters, OR

Collectively the Three Sisters are the third, fourth, and fifth highest peaks in Oregon, with South Peak being the tallest of the three.

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Peaks

South Sister

Stratovolcano in Willamette NF, Three Sisters Wilderness, Cascade Range near Sisters, OR

North Sister

Shield Volcano in Willamette NF, Three Sisters Wilderness, Cascade Range near Sisters, OR

Middle Sister

Stratovolcano in Deschutes NF, Three Sisters Wilderness, Cascade Range near Sisters, OR

On the Web

On Wikipedia

The Three Sisters are a complex volcano of three volcanic peaks of the Cascade Volcanic Arc and the Cascade Range in the U.S. state of Oregon. Each exceeding 10,000 feet (3,000 m) in elevation, they are the third-, fourth-, and fifth-highest peaks in the state of Oregon, and are located in the Three Sisters Wilderness, about 10 miles (16 km) south of the nearest town of Sisters. Diverse species of flora and fauna inhabit the area on and around the mountains, which is subject to frequent snowfall, occasional rain, and extreme temperature differences between seasons. The mountains, particularly South Sister, are popular for climbing and scrambling. Although they are often grouped together and seen as one unit, the three mountains evolved under differing geologic situations, and the…

Classified As

Stratovolcano

Geologic Formation

Basaltic andesite and basalt (ORQba;0)

Geologic Formation