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NavSource Online:
Identification Numbered Vessel Photo Archive


YNg-21 call sign:
Nan - Able - Fox - Queen

ex-Dreadnaught (YT-34)

YT-34 call sign (1924):
Nan - Cast - Xray

ex-Dreadnaught (ID 1951)

Navy call sign (1919):
George - Quack - Boy - Tare


  • Built in 1917 by the Union Iron Works, San Francisco, CA for the Rolph Navigation and Coal Company of San Francisco
  • Acquired by the Navy 17 May 1917
  • Delivered to the Navy 11 January 1918
  • Commissioned USS Dreadnaught (ID 1951), 31 January 1918 at Mare Island Navy Shipyard, Vallejo, CA
  • Reclassified as a Harbor Tug, YT-34 in 1920
  • Decommissioned 14 March 1922 and placed in service
  • Reclassified as a Gate Tender (non-self propelled), YNg-21, 7 October 1940
  • Struck from the Navy Register in September 1944 and destroyed.


  • Displacement 450 t.
  • Length 143'
  • Beam 28'
  • Draft 14' 10"
  • Speed 11.25 kts.
  • Complement 28
  • Armament: One 3"/50 mount and two machine guns
  • Propulsion: Two water tube boilers, one 1,000hp vertical triple-expansion steam engine, one shaft.
    Click on thumbnail
    for full size image
    Size Image Description Source
    Dreadnaught 91k Underway, probably prior to her World War I era Naval service
    U.S. Navy photo NH 94484
    Naval Historical Center
    USS Dreadnaught (YT 34)
    Dreadnaught 308k c. 1922
    Mare Island Navy Yard
    U.S. Navy photo
    Darryl Baker
    Dreadnaught 139k Pinola (AT 33), Algorma (AT 34) and Dreadnaught laid up in reserve at Mare Island Navy Yard, 11 April 1923
    Mare Island Navy Yard photo MINSY 4487-4-23 from the files of the Vallejo Naval and Historical Museum

    Commanding Officers
    01LT J. J. Carey, USNRF31 January 1918
    02LT Carl G. Selander, USNRF1918
    03LTJG George W. Knott, USNRF - Awarded the Navy Cross (1918)1919
    Courtesy Joe Radigan and Wolfgang Hechler

    View the Dreadnaught (ID 1951)
    DANFS history entry located on the Naval History and Heritage Command website
    Back to the Main Photo Index Back to the Identification Numbered Vessel (ID) Photo Index Back to the Yard and District Craft Index Back to the District Harbor Tug (YT) Photo Index Back to the Gate Craft (Non-self propelled) - (YNg) Photo Index

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    This page created by Joseph M. Radigan and maintained by David Wright
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