Missouri National Recreational River 4.39

Two-thirds of the "Mighty Mo" has been dammed, channelized
or otherwise "tamed" by the works of man. Missouri National
Recreational River preserves 98 miles of relatively natural,
free-flowing Missouri River, designated by Congress under the Wild and Scenic Rivers Act. MNRR also includes the lower 20 miles of the Niobrara River and the lower 8 miles of Verdigre Creek.