Lake Oahe "a memorandum and an executive order asking USACE to expedite its consideration of the company’s application for an easement to start construction." The USACE subsequently "withdrew its call for the environmental study." On 7 February 2017, the USACE approved an easement through Lake Oahe. On 9 February 2017, the Cheyenne River Sioux filed the first legal challenge to the easement, citing an 1851 treaty and interference with the religious practices of the tribe. Lake Oahe Lake Oahe (oh-WAH'-hee) is a large reservoir behind Oahe Dam on the Missouri River; it begins in central South Dakota and continues north into North
Lake Oahe Reservation occupy much of the western shoreline of Lake Oahe. Two possible burial sites of Sitting Bull, a Sioux leader, are located along Lake Oahe. One is near Fort Yates, North Dakota, while the other is near Mobridge. The shoreline and public lands around Lake Oahe contain various artifacts and cultural resources, especially important to many Native American tribes that have historically lived and traveled through the Missouri River Basin and the Lake Oahe area. All artifacts, including fossils and other objects are prohibited from collecting or damaging. The U.S. Army Corps of Engineers, along with other Federal and Tribal