During the era of Japanese occupation, the Japanese also built the Patungkuan security road in order to control the local aborigines. But the river flows by an untamed mountain wilderness. When one adds to this dangerously wead geology and topography, the challenges to opening a road are great. Only a simple foot path leads into the area now.
日據時期為管理當地山胞，日人也沿山過溪，另開八通關警備道路。