Stevenson is a city in the Columbia River Gorge National Scenic Area along the Columbia River in Skamania County, Washington, United S…Stevenson is a city in the Columbia River Gorge National Scenic Area along the Columbia River in Skamania County, Washington, United States. It is the county seat of Skamania County and home to the Skamania County Court House and Sheriff's Office. The population was 1,491 at the 2020 census.