Marble Mountain-Trout Creek Hill

Marble Mountain-Trout Creek Hill is a shield volcano in the Cascade Mountains standing at 2,946 feet with two cinder cones crowning its summit. The formation sits within a major volcanic arc and displays clear evidence of past eruptive activity.

This volcano formed during the Pleistocene roughly 340,000 years ago when lava flows traveled southeast and temporarily dammed the Columbia River. Its most recent eruption occurred around 7,700 years ago, shaping the volcanic field as it appears today.

The Wind River Experimental Forest surrounding Trout Creek Hill serves as a research center for forest ecology and tree species investigation.

The volcanic area can be reached via roads through Gifford Pinchot National Forest with trails to explore including the Pacific Crest National Scenic Trail. Access is available year-round, though conditions vary by season and weather.

The volcano forms part of the Marble Mountain-Trout Creek Hill volcanic field, where the most recent eruption occurred 7,700 years ago.

Location: Washington

GPS coordinates: 45.90000,-122.00000

Latest update: December 14, 2025 17:03