Discover how geologist J. Harlen Bretz uncovered the massive Ice Age flood that carved Washington’s remarkable Channeled Scablands

 When geologist J. Harlen Bretz proposed the theory that the rugged valleys and isolated rock formations of Eastern Washington were not formed gradually, but were instead carved out in a matter of days by a catastrophic, raging torrent, his peers dismissed him as a fool.

In 1923, it was a widely held belief that geological timescales spanned thousands of years—not days. Such vast valleys and towering landforms simply could not have come into existence overnight.

For over a decade, Bretz endured ridicule for this "absurd" idea—yet he was right. The "Channeled Scablands" of Eastern Washington were, in fact, created by a massive flood.

Bretz had spent years conducting fieldwork, meticulously mapping the unique features of the region.

He had observed what those who had never visited the area could not see: deep channels instead of ordinary valleys—dramatic erosional features that were truly astonishing.

There was, however, one lingering puzzle: he could not determine the source of this cataclysmic deluge.

Explaining Washington’s Most Unexpected Landscape

When people think of Washington, they often envision lush forests, mist-shrouded mountains, and rain—but that describes only one part of the state.

Much of Eastern Washington is the complete opposite: a vast, sun-scorched high desert stretching as far as the eye can see—a barren, scrub-covered expanse. 

Bretz found the geological composition of Eastern Washington absolutely fascinating. Every summer, he would take students to see deep volcanic rock canyons, mysteriously rippled terrain, colossal dry valleys, glacial erratics (boulders transported by ice), and other geological wonders that other scientists hadn't even bothered to examine closely.

He named this region the "Channeled Scablands"—a term alluding to the partially healed scars left upon the land by a cataclysmic event.

Years of meticulous observation led Bretz to the conclusion that a massive torrent had carved this landscape. However, it was another geologist, Joseph Pardee, who identified the source of this water: Glacial Lake Missoula, located in Montana.

The Great Flood that gave birth to the Channeled Scablands.

Montana is two states away from Washington... so, what kind of scale are we talking about here?

Immense. Unimaginable. Glacial Lake Missoula—which was as large as Lake Erie and Lake Ontario combined—formed when the Clark Fork River was dammed by a 2,000-foot-high wall of ice.

Toward the end of the last Ice Age, that ice dam gave way, and the lake drained westward in just two days. The National Park Service describes the event as follows:

"A wall of water, hundreds of feet high, roared forward at a speed of 65 miles per hour (105 kilometers per hour)—carrying ten times the volume of water found in all the world's rivers combined today.

This immense torrent of water, ice, and debris surged westward, shaking the earth and spreading across 16,000 square miles (41,440 square kilometers) of what is now Montana, Idaho, Washington, and Oregon."

The sudden release of such a massive volume of water was truly catastrophic. For anyone living in the vicinity 15,000 to 18,000 years ago, it would have seemed nothing short of an apocalypse.

Initially, Bretz believed that a single flood had carved these features; however, it later became clear that Lake Missoula had, in fact, filled and drained multiple times.

Bretz’s theory is vindicated; he receives recognition at the age of 97.

When Bretz first proposed his theory of a massive, violent deluge, mainstream geologists adhered to the principle of uniformitarianism—the belief that geological features are formed gradually over thousands or millions of years.

Bretz’s theory of catastrophism—the idea that a sudden, catastrophic event could radically transform a landscape in a short period—was dismissed as unscientific. 

John Soennichsen, Bretz’s biographer, wrote in his guidebook to the Channeled Scablands: "Bretz became a pariah within the geological community, which favored a scenario of slow, gradual change over millions of years—rather than a short-lived flood that sounded like a biblical catastrophe."

Eventually, Bretz was proven right. His discovery transformed the field of geology, as well as our understanding of the possibilities for humanity.

However, it was not until the 1970s that the concept of catastrophism gained full acceptance within the geological world, and Bretz’s contributions were finally acknowledged.

In 1979, at the age of 97, Bretz was awarded the Penrose Medal—the highest honor bestowed by the Geological Society of America.

Upon receiving the award, he remarked: "Perhaps I can be credited with reviving the idea of ​​catastrophism—stripping away its mystical connotations—and challenging the rigid doctrine of uniformitarianism."

He also jokingly remarked to his son, "All my enemies are dead, so now I have no one left to gloat over."