Area 51 the base extends further east. After leaving the restricted area, Groom Lake Road descends eastward to the floor of the Tikaboo Valley, passing the dirt-road entrances to several small ranches, before converging with State Route 375, the "Extraterrestrial Highway", south of Rachel. Area 51 shares a border with the Yucca Flat region of the Nevada Test Site, the location of 739 of the 928 nuclear tests conducted by the United States Department of Energy at NTS. The Yucca Mountain nuclear waste repository is southwest of Groom Lake. Groom Lake is a salt flat in Nevada used for runways of the
Minnesota State Highway 51 Highway 51 parallels State Highway 280 through Falcon Heights and the Midway neighborhood of Saint Paul. State Highway 51 was authorized in 1933. The route was paved by 1935. The original alignment on the south end of Highway 51 was from West 7th Street up Edgecumbe Road to Snelling Avenue. This section of Highway 51 was later rerouted to Montreal Avenue. From 1934 to 1935, the north end of Highway 51 previously followed Snelling Avenue northbound to County Road B in Roseville, then 51 turned westbound to Fairview Avenue and ran northbound along Fairview Avenue and New Brighton Road to