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is a city in Columbia County, Oregon, United States. The population was 1,687 at the 2000 census.
Rainier was founded in 1851 on the south bank of the Columbia River by Charles E. Fox and was originally named Eminence. The name Rainier was taken from Mount Rainier in Washington, which can be seen from hills above the city.
For much of the last quarter of the twentieth century, Rainier was known to the rest of Oregon as home to Trojan Nuclear Power Plant, the only commercial nuclear reactor in the state, which supplied electricity to Portland and its suburbs starting in March 1976. This reactor was closed periodically due to structural problems, and in January 1993, it was decommissioned after cracks developed in the steam tubes. On May 21, 2006, the cooling tower was demolished.
The closing of the Trojan plant set off a decline in the number of businesses in the city. While some retail and services are available in the city, there is currently, for example, no supermarket remaining in the city. Services are available in neighboring Clatskanie, St. Helens, and in Longview, Washington.