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Celilo Falls

Historical waterfall on the Columbia River in the U.S.

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Dipnet fishing at the Cul-De-Sac of Celilo Falls ( Columbia River ) around 1957, Oregon, Pacific Northwest, USA.
United States Army Corps of Engineers. · Public domain

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Through Waterfall, Flood and Rapids

Geography

Main waterfall

The main waterfall, known variously as Celilo Falls, The Chutes, Great Falls, or Columbia Falls, consisted of three sections: a cataract, called Horseshoe Falls or Tumwater Falls; a deep eddy, the Cul-de-Sac; and the main channel. These features were formed by the Columbia River's relentless push through basalt narrows on the final leg of its journey to the Pacific Ocean. Frequently more than a mile (1.6 km) in width, the river was squeezed here into a width of only 140 feet (43 m). The seasonal flow of the Columbia changed the height of the falls over the course of a year. At low water the drop was about 20 feet (6.1 m). In 1839, Modeste Demers investigated the area in some detail and described not just one fall but a great many, in different channels and with different qualities. He wrote, "The number and variety [of the channels and falls] are surprising. They are not all equally deep. The falls are from 3 to 12 and 15 feet high." During the spring freshet in June and July, the falls could be completely submerged. The falls were the sixth-largest by volume in the world and were among the largest in North America. Average annual flow was about 190,000 ft3/sec (5,380 m3/s), and during periods of high water or flood, as much as 1,240,000 ft3/sec (35,113 m3/s) passed over the falls.

The Narrows and The Dalles

Celilo Falls itself was the first in a series of cascades and rapids known collectively as The Narrows or The Dalles, stretching for about 12 miles (19 km) downstream. Over that length, the river dropped 82 feet (25 m) at high water and 63 feet (19 m) at low water.

Three miles (4.8 km) below Celilo Falls was a stretch of rapids known variously as the Short Narrows, Ten Mile Rapids, the Little (or Upper) Dalles, or Les Petites Dalles. These rapids were about 1 mile (1.6 km) long and 250 feet (76 m) wide. Ten miles (16 km) below Celilo Falls was another stretch of rapids, this one known as the Long Narrows, Five Mile Rapids, the Big (or Lower) Dalles, Les Grandes Dalles, or Grand Dalles. This stretch of rapids was about 3 miles (4.8 km) long, and the river channel narrowed to 75 feet (23 m). Immediately downstream were the Dalles Rapids (or Wascopam to the local natives), about 1.5 miles (2.4 km) long. Here the river dropped 15 feet (4.6 m) in a tumult much commented on by early explorers.

The Long Narrows and the Dalles Rapids are sometimes grouped together under names such as Grand Dalles, Les Dalles, Big Dalles, or The Dalles. One early observer, Ross Cox, noted a three-mile "succession of boiling whirlpools." Explorer Charles Wilkes described it as "one of the most remarkable places upon the Columbia." He calculated that the river dropped about 50 feet (15 m) over 2 miles (3.2 km) here. During the spring freshet, the river rose as much as 62 feet (19 m), radically altering the nature of the rapids. Fur trader Alexander Ross wrote, "[The water] rushes with great impetuosity; the foaming surges dash through the rocks with terrific violence; no craft, either large or small, can venture there safely. During floods, this obstruction, or ledge of rocks, is covered with water, yet the passage of the narrows is not thereby improved."

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