几天前有幸到清代乾隆年间修建在永定河房山县段内的金门闸遗址一观。保存尚好的金门闸是经过清中叶以后几次修茸的结果。这座原本用于引支流清水冲淤的闸，由于永定河沙淤日高，早已失去了原有的功能。解放以后虽然此闸还被利用，不过那只是对闸门稍加改建，倒过来引永定河水 A few days ago, it was fortunate that during the Qianlong reign of Qing Dynasty, a golden gate site was built in Fangshan County, Yongding River. Golden Gate Gate is still good to save after clearing the middle of several velvet after the results. This originally used for the tributary flow of water erosion and sedimentation of the gate, due to the high sediment deposition of Yongding River, already lost its original function. Although after the liberation of this gate has also been used, but it is only a slight renovation of the gate, in the end lead the Yongding River