Union Dam Trail is a hiking trail in Ellicott City, Maryland. It is within Patapsco Valley State Park: Hollofield Area. It is 0.7 miles long and begins at 387 feet altitude. Traveling the entire trail is 1.4 miles with a total elevation gain of 528 feet. The Valley Overlook viewpoint is near the trailhead. There are also restrooms, parkings, and shelters. Along the trail there is a shingle.
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