Boat travelers were required to either
portage boats and supplies or pull boats up with ropes.
Conflicts over portage rights Conflicts continued thereafter between the
Chinookan natives and Europeans and Americans, who generally refused to recognize the natives' authority over passage through the area. By 1813–14, fur traders passing through were resorting to violent force against the Indians. Although more diplomatic approaches eventually prevailed, a
malaria outbreak in the 1830s so reduced the populations of the Cascade and other Indian tribes, that they ceased to be a powerful force along the river. However, three forts,
Fort Cascades,
Fort Raines and
Fort Lugenbeel were constructed between present day
Stevenson, Washington and
North Bonneville over 1855–6 to protect the portage road around the rapids. Natives burned Fort Cascades in 1856, but it was rebuilt. This attack prompted the construction of Fort Lugenbeel. ==Steamboat navigation==