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Ainsworth State Park is a state park in eastern Multnomah County, Oregon, near Cascade Locks. It is located in the Columbia River Gorge, adjacent to the Historic Columbia River Highway. The park, administered by the Oregon Parks and Recreation Department, offers a seasonal, full-service campground, access to Gorge hiking trails beyond park boundaries, and a day-use area. Ainsworth State Park lies within the Columbia River Gorge National Scenic Area, and is 4 miles (6.4 km) from Multnomah Falls. It is named for John Churchill Ainsworth (1870-1943), a prominent Oregon businessman, Portland banker and chairman of the State Highway Commission from 1931 to 1932. He donated the land in 1933 that became the park and was a son of pioneer steam-boatman John Commingers Ainsworth.