《明史·志·卷六十三》
侯家湾、良城虽然有河形，但水中多有隐蔽的石头，很难凿通，即使开通它，水流湍急不能通行漕船。
侯家湾、良城虽有河形，水中多伏石，难凿，纵凿之，湍激不可漕。
Although there are river forms in Houjiawan and Liangcheng, there are many hidden stones in the water, which are very difficult to chisel through, and even if they are opened up, the water flow is too fast for漕ships to pass through.