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
Texas State Highway Spur 51 Texas State Highway Spur 51 Spur 51 is a state highway spur in Denton, Texas. It starts at State Highway 114 (SH 114), and ends on Elizabethtown Road. The road is not signed, but the designation has not been cancelled. The number originally belonged to Loop 51, designated on September 25, 1939, from U.S. Highway 77 (US 77) through Yoakum to US 77 (now Alternate US 77). The designation was changed to Business US 77-Q on June 21, 1990. The current route was designated on August 28, 1997. On January 25, 2001, Spur 51 was proposed for cancellation, but this