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The Cascades Rapids (sometimes called "Cascade Falls") is an area of rapids in the Columbia River where travelers by boat along the river were forced to either portage boats and supplies or pull boats up with ropes. It is generally held that these rapids or cascades (or the many cascades along the Columbia River Gorge in this area) gave rise to the name for the surrounding mountains: the Cascade Range.
Conflicts continued thereafter between the Cascade Indians and Europeans and Americans who generally refused to recognize the native's 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 1830's so reduced the populations of the Cascade and other Indian tribes, that they ceased to be a powerful force along the river.
A canal and lock around the rapids was completed in 1896 (see Cascade Locks, Oregon). But by 1938 the rapids were gone, submerged under Lake Bonneville as it formed behind Bonneville Dam. Bonneville Lock at the dam, completed in 1937, replaced the old Cascade Locks around the rapids.