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The Columbia River (Upper Chinook: Wimahl or Wimal; Sahaptin: Nch’i-Wàna or Nchi wana; Sinixt dialect swah'netk'qhu) is the largest river in the Pacific Northwest region of North America. [14] The river forms in the Rocky Mountains of British Columbia, Canada.
The Columbia River pours more water into the Pacific Ocean than any other river in North or South America. In its 1,270 miles (2,040 km) course to the Pacific Ocean, the Columbia flows through four mountain ranges—the Rockies , Selkirks , Cascades , and coastal mountains—and drains 258,000 square miles (668,000 km 2 ).
Water pumped from the Columbia River is carried over 331 miles (533 km) of main canals, stored in a number of reservoirs, then fed into 1,339 miles (2,155 km) of lateral irrigation canals, [1] and out into 3,500 miles (5,600 km) of drains and wasteways. [2]
A major radioactive contamination threat to the Columbia River should be removed at the Hanford nuclear site before the end of summer. Hanford workers have started to pump contaminated water from ...
Dec. 5—CASHMERE — The Columbia Basin Project is making gradual progress toward completion with significant accomplishments for the Odessa Groundwater Replacement Program and other milestones ...
The Columbia River and its tributaries generate 40% of U.S. hydropower, irrigate $8 billion in agriculture products and move 42 million tons of cargo annually, according to the Biden administration.
Left tributary Right tributary Length (km) Basin size (km 2) . Average discharge (m 3 /s) . Lower Columbia. Mouth to Bonneville Dam. Youngs: 43 257.6 14.7 Grays: 48 320 15.9 Elochoman
Elevation varies from 300 to 1,200 feet (90 to 370 m). Today, the region is the driest and warmest part of the Columbia Plateau, with mean annual precipitation varying from 7 to 10 inches (180 to 250 mm). Major irrigation projects provide Columbia River water to the region, allowing the conversion of large areas into agriculture.