Dart was built in 1911 by Matthew McDowell at Tacoma for his steamboat line’s Seattle-Tacoma-East Pass run.Dart a small vessel even by Mosquito Fleet standards, was 57.4' long, 17.4' on the beam, drew 5.2' and was rated at 74 tons.
Dart ran on the Seattle-Tacoma-East Pass route until about 1918, when Captain McDowell sold the vessel to the Wrangell concern of W.T. Hale and P.C. McCormick, who converted Dart to a motor vessel to run mail between Wrangell and Prince of Wales Island. Later, Dart was sold to Paul S. Charles of Ketchikan.interests. 
In 1925, Dart was purchased by the Anderson Tug Company and returned to Puget Sound to operate in tug work. In 1928, the vessel burned on the Sound while awaiting scrapping. Her engines were salvaged and placed in the ferry City of Mukilteo. Her hull, still good apparently, was rebuilt as a diesel freighter and sent to work routes out of Juneau.