Editing Celilo Falls (section)

===Main waterfall===
The main waterfall, known variously as Celilo Falls, The Chutes, Great Falls, or Columbia Falls,<ref name=gibson>{{cite book |last= Gibson |first= James R. | title= The Lifeline of the Oregon Country: The Fraser-Columbia Brigade System, 1811-47 |year= 1997 |publisher= University of British Columbia (UBC) Press |isbn= 0-7748-0643-5 |url= https://archive.org/details/lifelineoforegon0000gibs |url-access= registration |pages= [https://archive.org/details/lifelineoforegon0000gibs/page/125 125]–128}}</ref> consisted of three sections: a [[waterfall|cataract]], called Horseshoe Falls or Tumwater Falls; a deep eddy, the Cul-de-Sac; and the main channel.<ref name="database" /> 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&nbsp;km) in width, the river was squeezed here into a width of only 140 feet (43 m).<ref>{{cite book | last = Dietrich | first = William | title = Northwest Passage: The Great Columbia River | publisher = University of Washington Press | place = Seattle, WA | year = 1995 | page = 80 | isbn = 0-671-79650-X}}</ref> 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 {{convert|20|ft|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."<ref name=gibson/> 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.<ref>{{cite web |url=http://www.worldwaterfalldatabase.com/database.php?s=N&t=W&orderby=avevolume&sortLimit=5000 |title=World Waterfall Database |url-status=dead |archive-url=https://web.archive.org/web/20070927093831/http://www.worldwaterfalldatabase.com/database.php?s=N&t=W&orderby=avevolume&sortLimit=5000 |archive-date=2007-09-27 }}</ref> Average annual flow was about 190,000&nbsp;ft<sup>3</sup>/sec (5,380&nbsp;m<sup>3</sup>/s), and during periods of high water or [[flood]], as much as 1,240,000&nbsp;ft<sup>3</sup>/sec (35,113&nbsp;m<sup>3</sup>/s) passed over the falls.<ref name="database">{{cite web | title = World Waterfall database | url = http://www.worldwaterfalldatabase.com/waterfall.php?num=161 | access-date = 2008-02-01 | archive-date = 2006-11-28 | archive-url = https://web.archive.org/web/20061128154519/http://www.worldwaterfalldatabase.com/waterfall.php?num=161 | url-status = live }}</ref>

[[File:Celilo Falls Lee.jpg|thumb|left|Fishing sites existed along the entire length of The Narrows. [[Russell Lee (photographer)|Russell Lee]], September 1941.]]