Nebraska Highway 29Nebraska Highway 29 is a highway in western Nebraska. It runs for. It has a southern terminus at U.S. [Highway 26] in Mitchell and a northern terminus at U.S. Highway 20 in Harrison.Route descriptionNebraska Highway 29 begins in Mitchell at US 26. It proceeds north for to Agate and the Agate [Fossil Beds National Monument], where the highway crosses the Niobrara River. It continues north, with a short westerly segment, to Harrison, where it meets US 20 and ends.