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: Mine Warfare Vessel Photo Archive

USCGC Heather (WLB 331)
ex-USCGC Heather (WAGL 331)
ex-USS Obstructor (ACM 7)
ex-USAMP 1st Lieutenant William G. Sylvester



Obstructor served the US Army, Navy and Coast Guard

Chimo Class Auxiliary Minelayer:

  • Laid down in 1941 for the U.S. Army Coast Artillery Corps, Mine Planter Service as USAMP 1st Lieutenant William G. Sylvester at Marietta Manufacturing Co., Point Pleasant, WV
  • Launched in 1942
  • Transferred to the Navy 4 January 1945 and converted to an Auxiliary Minelayer at Charleston Navy Yard
  • Commissioned USS Obstructor (ACM 7), 1 April 1945
  • Decommissioned 28 June 1946 and transferred to the Coast Guard
  • Struck from the Naval Register 19 July 1946
  • Commissioned USCGC Heather (WAGL 331), 1 February 1947
  • Reclassified WLB-331 in 1965
  • Decommissioned 15 December 1967
  • Transferred to Seattle, WA 12 April 1968
  • Fate unknown.

    Specifications:

  • Displacement 1,300 t.
  • Length 188' 2"
  • Beam 37'
  • Draft 12' 6"
  • Speed 12.5 kts.
  • Complement 69
  • Armament: One 40mm gun mount, and four 20mm mounts
  • Propulsion: Two Combustion Engineering header type boilers, two 1,200shp Skinner Unaflow reciprocating engines, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    USS Observer (ACM 7)
    Obstructor 49k 15 June 1946
    Arriving back at San Francisco, CA
    Mel Haas MM/3c
    Former crew member
    USCGC Heather (WAGL 331)
    Obstructor 60k . Robert Hurst
    USCGC Heather (WLB 331)
    Obstructor 50k c. 1967 Robert Hurst

    Commanding Officers
    01LT Sammie Smith, USN1 April 1945
    Courtesy of Wolfgang Hechler and Ron Reeves

    View the Obstructor (ACM 7)
    DANFS History entry located on the Haze Gray & Underway Website
    View the Heather (WLB 331)
    history at the Coast Guard History Website
    Additional Resources and Web Sites of Interest
    Naval Minewarfare Association
    Association of Minemen

    Back To The Main Photo Index Back To the Mine Warfare Ship Photo Index Back To The Auxiliary Minelayer (ACM) Photo Index

    Comments, Suggestions, E-mail Webmaster

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