Celilo Falls was a big waterfall. 

Celilo Falls was on the Columbia River. 

Celilo Falls was a famous place on the Columbia River. 

The falls were very large. The river squeezed through narrow rocks. This made many waterfalls and rapids. The falls were the sixth-largest in the world by volume. Every year, millions of salmon swam through the water. Native people used nets and spears to catch them. They also traded goods from far away. Some items came from as far as Alaska.
In the 1950s, things changed. A new dam called The Dalles Dam was built. In 1957, the rising water covered the falls. The village and the fishing sites went under the lake. Today, a small community lives nearby at Celilo Village. A sonar study in 2008 showed the rocks are still there. They stay hidden under the water.
Celilo Falls was a famous and vital place on the Columbia River. 

The falls were created by the river pushing through narrow basalt rocks. 
Native peoples used the falls for fishing and trading for many centuries. 
In the early 1800s, explorers like Lewis and Clark visited the area. 
Today, the memory of Celilo Falls stays very strong. A small community lives at Celilo Village on a nearby bluff. In 2008, experts used sonar to look under the lake. 
Celilo Falls was a vital geographic and cultural landmark on the Columbia River. 
The physical structure of the falls was shaped by the river's power. The Columbia River is often more than a mile wide. At this specific point, the water squeezed into basalt narrows only 140 feet wide. 
The volume and appearance of the falls changed with the seasons. The average annual flow was about 190,000 cubic feet per second. During floods, the flow could reach 1,240,000 cubic feet per second. 
Celilo Falls served as a massive center for fishing and trade. 
Early explorers were often amazed by the site's activity. The Lewis and Clark Expedition passed through in 1805. They described it as a "great emporium" where many nations assembled. Historians have compared the area to the "Wall Street of the West." The Wishram people lived on the north bank. The Wasco people lived on the south bank. The most intense trading happened at the Wishram village of Nix-luidix. Other explorers, like Charles Wilkes, called it one of the most remarkable places on the river.
In the mid-20th century, the landscape was changed by industrial needs. Growing populations in the Pacific Northwest required more electricity. This energy was needed for aluminum production and shipbuilding. During World War II, 96 percent of the river's electricity went to war manufacturing. To meet this demand, the government decided to build The Dalles Dam. The Army Corps of Engineers began construction in 1952. In 1957, the rising waters of Lake Celilo submerged the falls and the village. This ended a way of life that had lasted for millennia.
Despite being underwater, the legacy of Celilo Falls continues. A small Native American community lives at Celilo Village on a nearby bluff. In 2008, a sonar survey was conducted to see the site. 
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