The Port of St. Helens is the port authority for St. Helens, Oregon, United States. The port is a municipal corporation formed under state law to engage in public development activities. Under Oregon law, port districts have a broad range of economic development powers. The Port of St. Helens owns and operates properties throughout its district from the Clatsop County line in the northwest of Columbia County, to the Multnomah County line in the southeast, a six-mile-wide band that follows 51 miles of the Columbia River within Columbia County. The boundaries include the cities of Scappoose, Warren, St. Helens, Columbia City, Rainier and Clatskanie. The Port of St.