Old Main Trail is a hiking trail in Portland, Oregon. It is within Tryon Creek State Natural Area. It is 0.6 miles long and begins at 178 feet altitude. Traveling the entire trail is 1.1 miles with a total elevation gain of 191 feet. The trail ends near the Nature Center information office and the Glenn L. Jackson Shelter. There are also drinking water, a bicycle parking, an information board, restrooms, and a picnic site near the end of the trail.
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