Etna was a steamboat that operated on the Lewis and Lake rivers of southwestern Washington from 1906 to 1919. As built in 1906 Etna was originally powered by a gasoline engine, but in 1907 it was converted to steam-powered vessel. Etna was named after Etna, Washington, a settlement on the south side of the Lewis River, in Clark County. Etna'''s principal activity was supporting the logging camps and lumber mills in the Lewis river area.Etna was a light draft vessel which was essential for operating in the shallow water of the upper Lewis River. Even then, operation of Etna was substantially affected by the rise and fall of river levels, which were generally seasonal. Small craft like Etna on the Columbia River system were sometimes referred to at the time as the "mosquito fleet" ConstructionEtna was built in Portland, Oregon in 1906 for Horace Campbell by the Portland shipyard of Joseph Supple. Campbell was a steamboat engineer with extensive experience on the Lewis and Lake rivers. DimensionsEtna was exclusive of the extension of the deck over the stern, called the fantail, on which the stern-wheel was mounted.Etna had a beam of exclusive of the protective timbers along the upper sides of the hull called guards. The vessel had a depth of hold of . The overall size of the vessel was 41 gross tons (a measure of volume and not weight) and 40 registered tons.Etna could carry about 10 tons deadweight of freight. The official merchant vessel registry number was 203622. Machinery The original power for Etna was a 30 horsepower gasoline engine. In August 1907, Horace Campbell had Etna converted from a gasoline engine to a steam-powered vessel. The steam power plant consisted of twin high-pressure single cylinder engines, horizontally mounted, each with a cylinder bore and stroke of . In December 1912, Etna Transportation Company, owners of Etna, bought an electric generator to install on the steamer. Electric lights were made necessary because of the increased level of traffic on the river required the steamer to operate during darkness, particularly in the winter when the days were shorter. Career Horace Campbell planned to use Etna on the Lewis River route in conjunction with the sternwheeler Mascot. Logging camps and mills up the Lewis river depended on shallow-draft steamers like Etna to bring in supplies. Etna also carried passengers. Proposed transfer to Willamette River In June 1910, when low