Once the waters have receded low enough and currents have subdued, construction on a new bridge commences. First, tall bamboo poles are rammed into the riverbed and a layer of split bamboo matting is laid on top to make the surface. More poles at different angles brace the foundation. The bridge is strong and wide enough to support the weight of light vehicles, but from afar it looks like a matchstick model.
Almost a kilometre long and made entirely of blonde bamboo poles, the bridge remains until it is submerged and washed away again every year when the Mekong, flush with snows from the Himalayas, surges again.
The Bamboo Bridge and Koh Paen, located a few blocks south of the bridge spanning the Mekong, is a solid bamboo structure built to Koh Paen island across the Mekong. On the other side is endless Cham and Khmer villages, entirely mounted on stilts. This is a great place to drive along if you want to check out the people of the land.
The bamboo bridge can even withstand trucks, so don't worry about whatever you're taking, just be careful not to fall into the river. The bridge is washed away as the river rises in the wet season, and access to the island is only possible by boat, but it is rebuilt again every dry season.
According to wikipedia