On March 31, on the bottom of the Shibangou Bridge in the 251 Provincial Road, an dredger was cleaned the sedimentary sandstone in the bottom of bridge and the garbage on the bridge cone slope. Due to the upstream sediment in the bottom of the arch bridge, it was resulted in poor drainage. In order to prevent flooding from affecting the flood season, the County Highway Bureau has taken precautions to carry out dredging work in advance so that there will be no dead ends left to ensure the safety of the bridges. It was firstly used silt curtains for controlling the silt and trash, then used dredger for river dredging. Up to now, the county has investigated more than 80 highway bridges and dredging 9 bridges.