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Columbia County, Oregon
Columbia County is a county located in the U.S. state of Oregon. As of the 2010 census, the population was 49,351.〔(【引用サイトリンク】url=http://quickfacts.census.gov/qfd/states/41/41009.html )〕 The county seat is St. Helens.〔(【引用サイトリンク】accessdate=2011-06-07 )〕 It was named for the Columbia River, which forms its eastern and northern borders.
Columbia County is included in the Portland-Vancouver-Hillsboro, OR-WA Portland metropolitan area.
==History==
The Chinook and Clatskanie Native Americans inhabited this region for centuries prior to the arrival of Robert Gray, captain of the ship ''Columbia Rediviva'', in 1792. The Lewis and Clark Expedition traveled and camped along the Columbia River shore in the area later known as Columbia County in late 1805 and on their return journey in early 1806.
Columbia County was created in 1854 from the northern half of Washington County. Milton served as the county seat until 1857 when it was moved to St. Helens.
Columbia County has been afflicted by numerous flooding disasters, the most recent in December 2007. Heavy rains caused the Nehalem River to escape its banks and flood the city of Vernonia and rural areas nearby. Columbia County received a presidential disaster declaration for this event.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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