Qualla: Klamath Basin

Klamath Basin: Introduction

Fri, 23 Jan 2026 00:00:00 GMT

Photo credit Shannon1, CC BY-SA 4.0. Eleven thousand years ago, a freshwater sea covered this high desert. Lake Modoc stretched across the entire Upper Klamath Basin, a body of water three times larger than the Salton Sea in southern California. When the ice age ended, the great lake drained away, leaving behind a labyrinth of rivers, marshes, and smaller lakes that still pulse with life. Today, up to 3.7 million birds migrate through the basin's remaining wetlands each year, following an ancient route that predates human memory. The Klamath Basin spans two states, seven counties, and contains one of the most contested water systems in the American West.

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Image: Shannon1 | CC BY-SA 4.0

Klamath Basin: Water Writes the Story

Fri, 23 Jan 2026 00:00:00 GMT

Photo credit U.S. Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS), Public domain. The Klamath River drains 9.4 million acres of Oregon and California, thirty-five percent north of the state line and sixty-five percent to the south. The watershed defies simple description: semi-desert at lower elevations in Oregon, dry alpine in the upper reaches, temperate rai...

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Image: U.S. Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) | Public domain

Klamath Basin: Layers of Ancient Rock

Fri, 23 Jan 2026 00:00:00 GMT

Photo credit Shannon1, CC BY-SA 4.0. Beneath the basin lies a geological puzzle box. The Upper Klamath Watershed sits between the Cascade Range and the Basin and Range Province, its bedrock a stack of volcanic deposits, ejecta, and fluviolacustrine sediments. Three distinct hydrologic layers control how water moves ...

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Image: Shannon1 | CC BY-SA 4.0

Klamath Basin: The Human Equation

Fri, 23 Jan 2026 00:00:00 GMT

Photo credit Shannon1, CC BY-SA 4.0. About 114,000 people lived within the Klamath watershed as of the 2000 census, concentrated around Klamath Falls, Oregon (population 19,462) and Yreka, California (7,290). Land ownership tells a story of competing claims: 90,000 acres under tribal reservation control, 6.2 million...

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Image: Shannon1 | CC BY-SA 4.0

Klamath Basin: Rivers That Define a Region

Fri, 23 Jan 2026 00:00:00 GMT

Photo credit Shannon1, CC BY-SA 4.0. The Williamson and Sprague rivers flow from the north, draining 19.4 percent of the watershed. The Lost River basin to the southeast is the largest subwatershed by area, claiming another 19.1 percent. The Shasta, Scott, and Salmon rivers drain the western slopes. The Trinity Rive...

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Image: Shannon1 | CC BY-SA 4.0