The Great Flood That Carved the Canyon
Narrator: Welcome to the edge of the Snake River Canyon in Twin Falls, Idaho! Before us stands Shoshone Falls, a waterfall even taller than Niagara Falls. But how did this massive canyon get here? Let’s travel through time with our team to find out.
Maya: Look at those towering dark cliffs! They look like giant stone steps. Dr. Ramos, did a simple river really carve out this huge canyon?
Dr. Ramos: Excellent question, Maya. The Snake River flows through here today, but it did not do all this heavy lifting alone. It had help from one of the greatest floods in Earth's history: the ancient Bonneville Flood!
Captain John: A flood? As an explorer of these western lands, I have seen mighty rivers, but the sheer size of this canyon is mind-blowing. When did this great flood happen?
Dr. Ramos: Around fifteen thousand years ago, during the last Ice Age. To the south, in what is now Utah, there was a massive body of water called Lake Bonneville. It was almost as large as Lake Michigan!
Narrator: Imagine a lake so full that the water had nowhere left to go.
Maya: So, what happened? Did the lake overflow?
Dr. Ramos: Yes! A natural dam made of soil and rock failed at a place called Red Rock Pass. Suddenly, a colossal wall of water broke free. It rushed north and west with unimaginable power.
Captain John: Incredible! How much water are we talking about?
Dr. Ramos: At its peak, the flood discharged millions of cubic feet of water per second. It was a churning torrent of mud, giant boulders, and ice. This monstrous wave ripped through the landscape, tearing away the hard volcanic rock called basalt.
Narrator: The floodwaters acted like a giant sandpaper machine, gouging out the deep canyon we see today in a matter of weeks, rather than over millions of years.
Maya: Wow! So the canyon was carved almost overnight in geological time?
Dr. Ramos: Exactly, Maya. That is what we call a catastrophic event. It completely reshaped the geography of southern Idaho.
Captain John: And it left behind this magnificent waterfall! Shoshone Falls must be the crown jewel of this ancient path.
Narrator: Today, Shoshone Falls drops over two hundred feet. It stands as a roaring reminder of the day Lake Bonneville broke its bounds and carved its name into the earth forever.
Listen to The Great Flood That Carved the Canyon
PicoBuddy read-aloud story
- catastrophic:
- Involving or causing sudden, great damage or major physical changes to the earth.
- basalt:
- A dark, hard volcanic rock that often forms towering cliffs or columns.
- torrent:
- A fast, strong, and rushing stream of water or other liquid.
- discharge:
- To release, pour out, or empty water from a source.
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About this reader's theater passage for Upper Elementary
“The Great Flood That Carved the Canyon” is a reader's theater reading passage about The Bonneville Flood and Shoshone Falls, written for Upper Elementary. It takes about 3 minutes to read (408 words) and comes with an interactive quiz and a printable worksheet with comprehension questions and an answer key.