Before the ice ages, Hesjedalselva flowed gently out to meet the river where Eidsfjorden lies now. During the ice ages the glacier carved much deeper in Eidsfjord than in Hesjedalen. This is the reason why the otherwise so flat Hesjedalselva River now cascades out into the 80 metre high Hesjedals waterfall where it meets Eidsfjord. The waterfall to the right is man-made in order to reduce the splash from the natural waterfall. The real improvement came when the bridge and road were built. The construction was finished in 1930.