Sentinel was a small wooden propeller-driven steamship of the Puget Sound Mosquito Fleet.

Sentinel was built in 1898 for the Hunt Brothers, who ran a family steamboat business on Puget Sound.

The Hunts ran the vessel to stops on Bay Island in southern Puget Sound, and also on a run to Seattle with mail stops on Vashon Island.

The vessel was sold to Hansen Transportation Co. in 1903, rebuilt and widened so as to increase passenger capacity from 100 to 250.

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