id author title date pages extension mime words sentences flesch summary cache txt en-wikipedia-org-1717 Red River of the South - Wikipedia .html text/html 3865 359 76 Texas is to the right, Oklahoma is on the left, and the border between the two states runs along the south (right) bank of the river. The south bank of the Red River formed part of the US–Mexico border from the Adams–Onís Treaty (in force 1821) until the Texas Annexation and the Treaty of Guadalupe Hidalgo. It then forms a short border between Texas and Arkansas before entering Arkansas, turning south near Fulton and flowing into Louisiana, where it feeds the Atchafalaya River. The Red River took a new channel near Natchitoches, Louisiana, and left behind Cane River Lake. In June 2015, the Red River flooded parts of northeast Texas, southwest Arkansas, southeast Oklahoma and Louisiana, from Denison Dam, to just south of Alexandria, Louisiana.[12] In 1943, Denison Dam was built on the Red River to form Lake Texoma, a large reservoir of 89,000 acres (360 km2), some 70 miles (110 km) north of Dallas. ./cache/en-wikipedia-org-1717.html ./txt/en-wikipedia-org-1717.txt