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积冰潭岛上的汇通词现己修葺一新，由于对其脚下的铁棂闸介绍甚少，以致鲜为人知。《明实录》载，铁棂间建于明洪武初期，南移元大都北城墙之时。当时，西北郊的玉泉、马眼诸水至西直门后分流，一条向南经南护城河至大通桥一条东行入北护城河，再沿东城墙南至大通桥。两流汇合
The Huitong words on Jibingtan Island have been completely rehabilitated, and little is known about the iron gates at their feet. In the “Mingshi County Record”, the iron and steel chamber was built in the early days of Ming Hongwu, and when the south moved to the north city wall of the capital Dadu. At that time, the Yuquan and Mayan waters in the northwestern suburbs were diverted to Xizhimen, one southbound through the south moat to Datong Bridge and one eastbound to the north moat, and then along the east wall south to the Datong Bridge. Two-stream convergence