)In or about 1891, the present-day Tatshenshini River (pre-1891 upper Alsek River) was assigned the name "Tatshenshini" by the Canadian government, and the pre-1891 lower Kaskawulsh River became the present-day upper Alsek River.About 1897, Jack Dalton established a trading post near the location where the present-day Tatshenini begins to flow westward.