The Portland is a historically significant sternwheel steamboat built in 1947 by Northwest Marine Iron Works for the Port of Portland, Oregon. She features a steel hull complemented by a wooden superstructure, representing the traditional construction methods of her type. As the last steam-powered, sternwheel tugboat built in the United States, Portland holds a notable place in maritime history, being listed on the National Register of Historic Places in 1997. Designed with traditional propulsion at the request of the Columbia River Pilots Association, she was originally conceived as a diesel screw-driven vessel but was constructed as a steam-powered sternwheeler. Her steam engine drives a large paddlewheel at her stern, a design that distinguished her from more modern tugboats that employed diesel propulsion. Her service life spanned from her commissioning on August 29, 1947, until her retirement in 1981, during which she operated for Willamette Tug & Barge and Shaver Transportation. She primarily assisted ships navigating the Columbia River, including oil tankers and container ships, until vessel sizes and port capabilities rendered her assistance less necessary. After retirement, Portland was acquired by the Oregon Maritime Museum in 1991 for a nominal fee and underwent extensive restoration, completed in 1993, which transformed her into a functioning museum ship. She was inspected and temporarily limited in passenger operations until 2008, when additional funds and volunteer effort restored her to full service. Today, she is moored at the Willamette River seawall, adjacent to Tom McCall Waterfront Park in downtown Portland, serving as a museum and tourist attraction. She has participated in historic races, notably recreating a 1952 race against the sternwheeler Henderson, and continues to be a symbol of Portland’s maritime heritage. Her presence and preservation highlight her importance as an outstanding example of traditional steam-powered tugboat construction and operation in the United States.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.