Grahamona was a sternwheel steamboat built in 1912 for the Oregon City Transportation Company, commonly known as the Yellow Stack Line. Grahamona was specially designed to serve on the shallow waters of the upper Willamette River. It was one of the largest steamboats ever to operate on the upper Willamette. In 1920, Grahamona was sold and the name was changed to Northwestern. In 1939, the vessel was sold again, and transferred to Alaska for service on the Kuskokwim River.