Below the Kawarau junction, the river flows southeast through the inundated Cromwell Gorge to Clyde and nearby Alexandra, where it is joined by the waters of the Manuherikia River. South of Alexandra the river widens again to form Lake Roxburgh, another artificial lake, behind the Roxburgh Dam. In 1956, the hydroelectric reservoir flooded the Roxburgh Gorge and several large rapids including the Molyneux Falls and the Golden Falls. The town of Roxburgh sits close to the river, downstream from Lake Wānaka.