page_title: Walla Walla River
section_title: History
hierarchical_section_title: Walla Walla River / History
caption_attribution_description: Wind Turbines seen looking across the w:Walla Walla River. Taken by uploader. All rights released. Williamborg 04:10, 9 July 2006 (UTC)
context_page_description: The Walla Walla River is a tributary of the Columbia River, joining the Columbia just above Wallula Gap in southeastern Washington in the United States. The river flows through Umatilla County, Oregon, and Walla Walla County, Washington. Its drainage basin is 1,758 square miles in area.
context_section_description: The Walla Walla tribe occupied the region around the Walla Walla river prior to white settlers entry to the region.
  The Lewis and Clark Expedition (1804–1806) was the first United States overland expedition to the Pacific coast and back—the return expedition stopped at the mouth of the Walla Walla and stayed with the Walla Walla tribe for a portion of the journey, proceeding from there overland to the Snake River. British explorer David Thompson was the first European to navigate the entire length of the Columbia River, to the Pacific Ocean, in 1811.
  Fort Nez Percés  (later known as Fort Walla Walla) was a fortified fur trading post on the Columbia River on the territory of modern-day Wallula, Washington. It was in operation from 1818 until 1857 on the eastern shore of the Columbia River, immediately north of the mouth of the Walla Walla River. The Oregon Treaty ended joint U.S.A. - British occupation that had been effect since the Treaty of 1818. The fort was abandoned in 1857 when the Hudson's Bay Company gave up its Columbia District business in the Oregon Territory.
  The Whitman Mission was established in 1836. It lies near the banks of the river to the west of the modern city of Walla Walla.
caption: Wind turbines over the lower Walla Walla. River depleted by irrigation water withdrawal.
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