On this day 67 years ago, December 9, 1958 (October 29, 1958 lunar calendar), the closure project of the Yellow River Sanmenxia ended. The completed Sanmenxia Water Conservancy Hub Project of the Yellow River Sanmenxia Water Conservancy Hub was completed on December 9, 1958. The project was started on April 13, 1957 and is located in Shaanxi County, Henan Province and Pinglu County, Shanxi Province in the middle reaches of the Yellow River. It is the largest and most important flood control, power generation and irrigation comprehensive project in the plan to root out and develop the Yellow River. After the closure of the Yellow River, it can create a reservoir of 3,500 square kilometers, with a capacity of 64.70 billion cubic meters and irrigation of farmland 40 million mu.