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Astoria, city, seat (1844) of Clatsop county, northwestern Oregon, U.S., on the south bank of the Columbia River (there bridged to Megler, Washington) near its mouth on the Pacific Ocean. It is near the site of Oregon’s first military establishment, Fort Clatsop, built by the Lewis and Clark Expedition, which wintered there (1805–06); the reconstructed fort, 4.5 miles (7.5 km) southwest, is a national memorial. In 1810–11 John Jacob Astor sent an expedition to establish...