Please report any broken links or trouble you might come across to the Webmaster. Please take a moment to let us know so that we can correct any problems and make your visit as enjoyable and as informative as possible.

NavSource Online:
Section Patrol Craft Photo Archive

Tamarack (SP 561)


  • Built in 1915 as Elmarlu by Nevins Shipyard, City Island, NY for James H. Ottley of Glen Cove, Long Island, NY
  • Acquired by the Navy 25 June 1917
  • Commissioned USS Tamarack (SP 561), 18 September 1917
  • Struck from the Navy list 21 February 1919 and returned to her owner
  • Renamed Elmarlu
  • Fate unknown.


  • Displacement 47 t.
  • Length 80'
  • Beam 13' 3"
  • Draft 4' 5"
  • Speed 9 kts.
  • Complement 12
  • Armament: Two 1-pounders and two machine guns
  • Propulsion: Two 70hp 4-cylinder Sterling gasoline engines, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    Tamarack 59k Photo by Edwin Levick Tom Nye
    Tamarack 117k
    Tamarack 70k Photographed prior to her World War I Naval service
    U.S. Navy photo NH 102038
    USS Tamarack (SP 561)
    Tamarack 167k Tamarack passing New Mexico BB-40. Most likely in New York City Area
    N. Moser, NY
    Jay Milewski
    Photo added 5 December 2019

    Commanding Officers
    01Chief Quartermaster Theodore Lambert DeCamp, USNRF29 December 1917
    02ENS Alexander White Moffat, USNRF18 February 1918
    Courtesy Joe Radigan

    View the Tamarack (SP 561)
    DANFS history entry located on the Naval History and Heritage Command website
    Back to the Main Photo Index Back to the Patrol Craft/Gunboat/Submarine Chaser Ship Index Back to the Section Patrol Craft (SP) Photo Index

    Comments, Suggestions, E-mail Webmaster

    This page created and maintained by Joseph M. Radigan
    All pages copyright NavSource Naval History