Robert Sibley Volcanic Regional Preserve

Oakland, California

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1 Review
3 out of 5
What do the Robert Sibley Volcanic Regional Preserve and Mount Saint Helens have in common? The subduction process that caused the explosion here ten million years ago of a great volcanic center eventually moved northward to cause the activity and eruption of Washington’s Mount Saint Helens. The park trail guide available at the trailhead includes a self-guided tour of Round Top’s fascinating geological journey. Hiking among Monterey pines and on open grassy hills, you will see walls of the caldera left by the ancient blast, old river gravels, basalt lava flows, and varicolored “redbeds,” layers of oxidized iron explored worldwide for fossils. Remains have been found of mastodons, hipparions, camels, and prongbucks in the old quarries here. More recently, enthusiastic hikers have built a series of rock mazes in the quarries, complete with altars at their centers. Walking through these formations and admiring the offerings at the altars provide great entertainment. The park is pleasant for walking or jogging. Overall, the hike is easy but with many rising and falling slopes. Those wishing them can find steeper descents up to Round Top and out of the quarries. This eTrail also includes suggested nearby attractions, camping & lodging, restaurants, and local outdoor retailers.

Robert Sibley Volcanic Regional Preserve Professional Review and Guide

"What do the Robert Sibley Volcanic Regional Preserve and Mount Saint Helens have in common? The subduction process that caused the explosion here ten million years ago of a great volcanic center eventually moved northward to cause the activity and eruption of Washington’s Mount Saint Helens. The park trail guide available at the trailhead includes a self-guided tour of Round Top’s fascinating geological journey. Hiking among Monterey pines and on open grassy hills, you will see walls of the caldera left by the ancient blast, old river gravels, basalt lava flows, and varicolored “redbeds,” layers of oxidized iron explored worldwide for fossils. Remains have been found of mastodons, hipparions, camels, and prongbucks in the old quarries here. More recently, enthusiastic hikers have built a series of rock mazes in the quarries, complete with altars at their centers. Walking through these formations and admiring the offerings at the altars provide great entertainment. The park is pleasant for walking or jogging. Overall, the hike is easy but with many rising and falling slopes. Those wishing them can find steeper descents up to Round Top and out of the quarries. This eTrail also includes suggested nearby attractions, camping & lodging, restaurants, and local outdoor retailers."

Activity Type: Hiking
Nearby City: Oakland
Distance: 3.6
Trail Type: Loop/Lollipop
Skill Level: Easy to Moderate
Duration: 2 hours
Season: Year-round, 5:00 a.m. to 10:00 p.m.
Trailhead Elevation: 1,370 feet
Top Elevation: 1,600 feet
Local Contacts: East Bay Regional Park District Headquarters

Robert Sibley Volcanic Regional Preserve Reviews

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5/28/2006
The first part of the trail from the parking lot is very nice, but most of the hike is on a dusty road in the open. Would be nice if the trails that end at the propery lines could be joined so you can loop back without returning on same path. Interesting geology and nice birds.
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Jun 2018