三峡航道,夙以河道窄,水流急,落差大,险滩多而被称为天险。三峡航道,由奉节到宜昌长209公里。江流蜿蜒于崇山峻岭间,江面最宽只有200多米,最窄处不及100米。两岸山高坡陡,溪沟密布,暴雨洪水将大量砂石冲出,堆积在长江岸边,形成大大小小的溪口滩;干流峡谷壅水处形成峡口滩,加之江中的礁石、石梁等,共形成急流险滩100多处,历来海损事故频繁,航行者视为畏途。建国后,航运部门进行了大力整治,航道有所改善,但凶滩恶水的局面依然存在。枯水期,航深只有2.9米,每马力只能拖带0.7～0.9吨货量,不少江段需设置绞滩站绞船过滩。1981年1月4日葛洲坝工程大江截流,5月11日 The Three Gorges waterway, 夙 narrow rivers, water current, drop big, rapids and more known as natural hazards. Three Gorges Channel, from Fengjie to Yichang 209 km long. Rivers meandering in the mountains, the widest of the river is only 200 meters wide, the narrowest place less than 100 meters. Both sides of the mountain slope steep, densely covered ditch, storm floods will be a large number of sand out, accumulation in the Yangtze River bank, the formation of large and small Xikou Beach; the formation of gorge canyon dry gorge, together with the river rocks, stone Beams and so on, forming a total of more than 100 rapids rapids, the sea has always been the cause of frequent accidents, voyagers as fear Road. After the founding of the People’s Republic of China, the shipping department conducted a great deal of remediation and the navigation channel improved. However, the situation of evil and evil water still existed. Dry season, the flight depth of only 2.9 meters per horsepower can only drag 0.7 to 0.9 tons of cargo volume, many sections of the stranding station to be set stranding shoals across the beach. January 4, 1981 Gezhouba Dam closure, May 11