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} |} ''Portland'' (or the ''Portland'') is a sternwheel steamboat built in 1947 for the Port of Portland, Oregon, in the United States. The ''Portland'' is listed on the National Register of Historic Places, and presently hosts the Oregon Maritime Museum which owns the vessel. The vessel is moored at the Willamette River seawall next to Tom McCall Waterfront Park in downtown Portland. ==History== The ''Portland'' was built in 1947, and delivered to the Port of Portland on August 29th.〔 She was operated as a tug by both Willamette Tug & Barge and Shaver Transportation〔 until she was retired in 1981.〔 By that time, the Port of Portland was serving oil supertankers from Alaska that were too large for the ''Portland'' to assist, and container ships with bow thrusting capabilities that reduced the need for tug assistance.〔 At a time when steam paddlewheels were giving way to more modern propulsion systems. The ''Portland'' was originally proposed as a diesel-powered screw-driven vessel, but at the request of the Columbia River Pilots Association she was built with more traditional propulsion.〔 As a result, she was the last steam-powered, sternwheel tugboat built in the United States.〔〔 She was also the last such vessel still in service in the U.S. at the time of her retirement in 1981.〔 For these reasons, she is listed on the National Register of Historic Places as "an outstanding representative of her type and method of construction."〔 The ''Portland'' was built to replace her predecessor of the same name, built in 1919.〔 Unlike her predecessor,〔 the present ''Portland'' is built with a steel hull, and a wooden superstructure.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Portland (steam tug 1947)」の詳細全文を読む スポンサード リンク
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