上海志丹路、延长西路口的元代水闸遗址已经发掘,它堪称申城重大的考古发现。由于该水闸位处吴淞江下游故道支流,所以对人们了解昔日当地水利情况很有意义。吴淞江古称松江,系太湖主要泄水通道,河口段唐代宽二十里,宋代宽九里。吴淞江下游南岸的青龙镇(今上海青浦区旧青浦镇), Shanghai Zhidan Road, the extension of the western entrance of the Yuan Dynasty floodgate site has been excavated, it can be called Shanghai’s major archaeological discoveries. Because the water gate is located in the downstream tributary of the Wusong River, it makes sense to understand the past local water conservancy. Wusong ancient Songjiang River, Department of Taihu Lake main drainage channel, estuary wide twenty years in the Tang Dynasty, Kuan Jiuli in the Song Dynasty. Qinglong Town on the south bank of the lower reaches of the Wusong River (now Old Qingpu Town, Qingpu District, Shanghai)