MNRR meaning in Governmental ?

Answer: What is Missouri National Recreational River mean?

The Missouri National Recreational River is a National Recreational River located on the border between Nebraska and South Dakota. The designation was first applied in 1978 to a 59-mile section of the Missouri River between Gavins Point Dam and Ponca State Park. In 1991, an additional 39-mile section between Fort Randall Dam and Niobrara, Nebraska, was added to the designation. These two stretches of the Missouri River are the only parts of the river between Montana and the mouth of the Missouri that remain undammed or unchannelized. The last 20 miles of the Niobrara River and 6 miles of Verdigre Creek were also added in 1991.

The Missouri National Recreational River is managed by the National Park Service, with headquarters located in Yankton, South Dakota. Visitor centers are located at Ponca State Park, Niobrara State Park and the Lewis and Clark Visitor Center at Gavins Point Dam, overlooking Lewis and Clark Lake. It lies in parts of Boyd, Cedar, Dixon, and Knox counties in Nebraska, and Bon Homme, Charles Mix, Clay, Union, and Yankton counties in South Dakota.

reference

Full Form	Category
Missouri National Recreational River	Governmental
Metro-North RailRoad	Regional