Klamath River

The Klamath River flows 257 miles through Oregon and northern California in the United States, emptying into the Pacific Ocean. By average discharge, the Klamath is the second largest river in California after the Sacramento River. It drains an extensive watershed of almost 16,000 square miles that stretches from the arid country of south-central Oregon to the temperate rainforest of the Pacific coast. Unlike most rivers, the Klamath begins in the high desert and flows toward the mountains – carving its way through the rugged Cascade Range and Klamath Mountains before reaching the sea. The upper basin, today used for farming and ranching, once contained vast freshwater marshes that provided habitat for abundant wildlife, including millions of migratory birds. Most of the lower basin remains wild, with much of it designated wilderness. The watershed is known for this peculiar geography, and the Klamath has been called "a river upside down" by National Geographic magazine.
The Klamath is the most important North American river south of the Columbia River for anadromous fish migration. Its salmon, steelhead and rainbow trout have adapted to unusually high water temperatures and acidity levels relative to other rivers in the Pacific Northwest. The numerous fish were a major source of food for Native Americans, who have inhabited the basin for at least 7,000 years. The first Europeans to enter the Klamath River basin were fur trappers for the Hudson's Bay Company in the 1820s; they established the Siskiyou Trail along the Klamath and Trinity rivers into the Sacramento Valley. Within several decades of white settlement, native peoples were forced into reservations. During the latter days of the California Gold Rush, increasing numbers of miners began working the Klamath River and its tributaries, causing considerable harm to the environment. Conflict and introduced diseases left indigenous tribes with only 10% of their original population.

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