The Yellow River is the mother river, Lanzhou section is the upper reaches of the Yellow River, there are not many bridges, the Yantan Bridge has the reputation of the Lanzhou Yellow River "first rainbow bridge", the total length is 816 meters, the bridge type is three-span continuous steel pipe concrete rigid frame arch bridge, the bridge is 31 meters wide, the west leads the bridge is 75 meters long, and the east leads the bridge is 440 meters long. Continuous reinforced concrete beam bridge, composed of main bridge, guide bridge, guide road, auxiliary road, rainwater, lighting, etc. Near attractions