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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
  • Registered in 1920 to as the yacht Tamarack out of Detroit, MI
  • Fate unknown.


  • Displacement 47 t.
  • Length 80'
  • Beam 13' 3"
  • Draft 4' 5"
    1920 - 7.1'
  • Speed 9 kts.
  • Complement 12
    1920 - Four
  • 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 72k

    Tamarack - A deciduous North American larch tree, Larix laricina, having short needles borne on spur shoots

    Tommy Trampp
    Photo added 7 March 2022
    Tamarack 167k Tamarack passing New Mexico BB-40. Most likely in New York City Area
    N. Moser, NY
    Jay Milewski

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