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Wasco County is a county located in the state of Oregon.
The Territorial Legislature created Wasco County on January 11, 1854 from the parts of Clackamas, Lane, Linn and Marion counties, that were east of the Cascade Range -- which included most of Idaho, and parts of Montana and Wyoming.
Wasco county attracted international attention in the 1980s, when Bhagwan Shree Rajneesh came to the United States and settled for several years at a marginal ranch called "The Big Muddy", but later known as Rajneeshpuram.
Wasco County is named for the Wasco (or Wascopam) tribe of Indians that lived south of the Columbia River, near The Dalles.
When Wasco County was created from portions of Clackamas, Marion, Linn, and Lane Counties on January 11, 1854, it consisted of all of Oregon Territory between the Cascade Range and the Rocky Mountains and from latitude 42deg.
It is bordered by two rivers, the Columbia to the north and the Deschutes to the east, and by the Warm Springs Indian Reservation on the south and Mt. Hood National Forest on the west.