Watch Up the Yangtze for Free: How to Stream the Movie Online at 123Movies. . A luxury cruise boat motors up the Yangtze - navigating the mythic waterway known in China simply as "The River." The Yangtze is about to be transformed by the biggest hydroelectric dam in history. At the river's edge - a young woman says goodbye to her family as the floodwaters rise towards their small homestead. The Three Gorges Dam - contested symbol of the Chinese economic miracle - provides the epic backdrop for Up the Yangtze, a dramatic feature documentary on life inside modern China.