 The highway travels through sparsely-populated areas along the river and passes near the Rocky Reach Dam and through the town of Entiat.Wagon roads along the west side of the Columbia River were plotted in the 1880s by American settlers and added to the state highway system in 1897.The wagon road was designated as State Road 10 (later the Lake Chelan and Okanogan Highway) and was completely paved by the late 1930s.