By Mail HQ, Missouri National Recreational River P. O. Box 591 O'Neill, NE 68763
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Missouri National Recreational River P.O. Box 666 Yankton, SD 57078
By Phone Headquarters NPS: 402-336-3970 Visitor Information NPS: 402-667-2550
By Fax 402-667-2552
Did You Know?
Before the 1950s, the Missouri River carried an average of roughly 140 million tons of sediment per year past Yankton. After closure of the dams in the 1960s, an average of roughly 4 million tons per year moved past the same location.