american Calmar S. S. Co. Inc. SS Portmar (+1943)
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nationality american
purpose transport
type cargo ship
propulsion steam
date built 1919
is nickname no
weight (tons) 5643  grt
dimensions 130.7 x 16.5 x 8.4 m
material steel
engine triple expansion engine
power 582  n.h.p.
speed 11.5  knots
yard no. 1013
IMO/Off. no. 2219283
call sign
about the loss
cause lost torpedo
date lost 16/06/1943  [dd/mm/yyyy]
casualties  max.2rank: 668
about people
Northwest Steel Co., Portland (Oregon)
engine by
Hooven, Owens & Rentschler Co., Hamilton (Ohio)
last owner
[1]Calmar S. S. Co. Inc., New York
SS Portmar (+1943)
period 1930 ~ 1943
IMO/Off. no.: 2219283
call sign: 
prev. owners
[2]Green Star S.S. Co., New York
SS Centaurus
period 1919 ~ 1930
IMO/Off. no.: 2219283
call sign: 
about the wreck
depth (m.)
war grave
entered by Vleggeert Nico
entered 05/05/2008
last update Vleggeert Nico
last update 02/01/2012
Vleggeert Nico05/05/2008
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copyright: Unknown - onbekend - inconnu
 copyright: Unknown - onbekend - inconnu copyright: Australian Hydrographic Service   
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Lettens Jan13/08/2012PORTMAR

5551 tons; 124.9x16.5x8.4 m.; Built at Northwest Steel Co. in 1919. Registered at New York.

On 16 June 1943, the Japanese submarine I-174 arrives off Smoky Cape. At 1637, she sights convoy GP 55 consisting of ten cargo vessels and three LSTs (Landing Ship Tank) escorted by RAN vessels KALGOORLIE, WARRNAMBOOL, DELORAINE, BUNDABERG and COOTAMUNDRA en route from Sydney to Brisbane. Lt Nanbu penetrates the screen of escorting corvettes.

At 1720, he fires two torpedoes at two overlapping transports. The second ship in the fourth column is 5,551-ton U.S. Army Transport PORTMAR, fully loaded with fuel and ammunition.

The 5,000-ton Landing Ship Tank LST-469 is hit at her starboard side aft. The blast destroys the steering gear and kills twenty-six men. Despite the severe damage LST-469 is eventually towed back to Sydney for repairs.

Moments after the explosion on the LST-469, PORTMAR's lookouts sight torpedo tracks and she goes hard to port. Before the maneuver can take effect the ship is hit by the second torpedo starboard side in No. 1 hold.

Gasoline on board explodes and the ship is ablaze fore and aft almost immediately. The ammunition explodes soon after. Seven minutes after being hit, the PORTMAR is abandoned.

Corvettes HMAS KALGOORLIE and HMAS WARRNAMBOOL chase and depth-charge I-174 unsuccessfully.

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About Builders
 Northwest Steel Co., Portland (Oregon)
Northwest Steel was next door to Columbia River Shipbuilding, on the west bank of the Willamette River, on SW Moody Avenue at the foot of SW Sheridan Street, which is just downstream of the Ross Island Bridge
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SS Portmar (+1943)
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