Klamath River

Klamath River (Ishkêesh)
Link River, Everglades of the West
The Klamath River in California
Name origin: For the Indian tribe called "Klamath" by early 19th-century white travelers
Country	United States
States	Oregon, California
Tributaries
- left	Shasta River, Scott River, Salmon River, Trinity River
City	Klamath Falls
Source	Upper Klamath Lake
- location	Klamath Falls, Oregon
- elevation	4,090 ft (1,247 m)
- coordinates	42°11′29″N 121°46′58″W / 42.19139°N 121.78278°W / 42.19139; -121.78278
Mouth	Pacific Ocean
- location	Requa, California
- elevation	0 ft (0 m)
- coordinates	41°32′49″N 124°5′0″W / 41.54694°N 124.08333°W / 41.54694; -124.08333Coordinates: 41°32′49″N 124°5′0″W / 41.54694°N 124.08333°W / 41.54694; -124.08333
Length	263 mi (423 km)
Basin	15,688 sq mi (40,632 km2)
Discharge	for near mouth (Klamath, CA)
- average	16,780 cu ft/s (475 m3/s)
- max	557,000 cu ft/s (15,772 m3/s)
- min	1,310 cu ft/s (37 m3/s)
Map of the Klamath River watershed

The Klamath River (Karuk: Ishkêesh,Klamath: Koke,Yurok: Hehlkeek 'We-Roy) flows 263 miles (423 km) 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 (41,000 km²) 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 largely agricultural upper basin once contained vast freshwater marshes that provided habitat for abundant wildlife, including millions of migratory birds; most of the mountainous lower basin remains wild. 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.