River Loop is a hiking and biking trail in Union County, South Dakota. It is 4.1 miles long and begins at 1,100 feet altitude. Traveling the entire trail is 8.1 miles with a total elevation gain of 190 feet. Along the trail there are a viewpoint, a farmland, a wood, and an information board. Near the end of the trail are restrooms, a bicycle repair station, a waste basket, and an information map.
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