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
Tabqa Dam 2017, after heavy fighting damaged the main control panel at the dam and disabled the hydroelectric power station, ISIL warned of the imminent collapse of the Tabqa Dam, during a joint US/SDF operation to capture the dam. SDF forces announced they captured the dam on 10 May 2017. The Tabqa dam is located on a spot where rocky outcrops on each side of the Euphrates Valley are less than apart. The dam is an earth-fill dam that is long, high from the riverbed ( above sea-level), wide at its base and at the top. The hydroelectric power station is located