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Upper Marshall Canyon Professional Review and Guide
"Much like Middle Marshall Canyon, Upper Marshall Canyon is popular with local hikers and riders. It also features a creek lined with stately oaks. In the spring, wildflowers burst into joyous bloom. This trail through the steep upper part of the canyon is a great way to get exercise while enjoying the outdoors. Poison oak is common in Marshall Canyon, so don’t stray off the trail."
--David & Jennifer Money Harris, Afoot and Afield: Inland Empire (Wilderness Press).
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