South Amboy in Middlesex County, New Jersey — The American Northeast (Mid-Atlantic)
1950 South Amboy Explosion
An explosion of tremendous violence occurred at approximately 7:26 pm on Friday, May 19, 1950, at the Pennsylvania Railroad Pier No. 4 (Powder Pier) at the foot of Augusta Street, South Amboy (across inlet). This event was the result of the simultaneous detonation of 450 tons of military munitions. Two shipments, one of land mines and one of dynamite, were being transferred from railroad cars onto barges for subsequent loading onto the steamship Flying Clipper.
At 7:50 pm South Amboy Mayor John D. Leonard declared a state of emergency and requested help from Governor Alfred E. Driscoll. The state police and military assistance were quickly provided. Fire departments, first aid squads, and Red Cross disaster units, from as far away as Pennsylvania, poured into the stricken city. First aid field units were set up in the streets to provide emergency treatment while nearby hospitals accommodated the more seriously injured. Nearly every one of the 2,700 homes and buildings in South Amboy suffered some damage. Broken glass was extensive. Complete failure of electric power darkened the city. The death toll mounted to 31 with only five bodies identified and more than 350 persons injured. The citizens of South Amboy handled the ordeal remarkably well. Government specialists rushed to the area to access community impact and were greatly impressed by the citys response. The actual cause of the detonation is unknown to this day.
This Historic Marker is a gift to the people of South Amboy from the Middlesex County Board of Chosen Freeholders, 2013.
Erected 2013 by Middlesex County Board of Chosen Freeholders.
Topics. This historical marker is listed in this topic list: Disasters. A significant historical date for this entry is May 19, 1950.
Location. 40° 29.077′ N, 74° 16.321′ W. Marker is in South Amboy, New Jersey, in Middlesex County. It is on Raritan Reach Road. The marker is behind the houses on the road and located at water's edge on the small boardwalk. Touch for map. Marker is in this post office area: South Amboy NJ 08879, United States of America. Touch for directions.
Regionally, this marker is in New Jersey’s Central Jersey, in Greater Princeton, and in the New York City Metropolitan Area. It is also in the American Northeast and in the Mid-Atlantic. Globally, it is in the North Atlantic Region, North America, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once New Netherland and also one of the original Thirteen Colonies.
Other nearby markers. At least 8 other markers are within walking distance of this marker: Alfred Aloysius "Allie" Clark (1923-2012) (approx. 0.2 miles away); Sergeant First Class Benjamin L. Sebban Memorial (approx. 0.4 miles away); First Air Mail Delivery Flight in New Jersey (approx. 0.4 miles away); Middlesex County Victims of Terrorism Memorial (approx. 0.4 miles away); Independence Engine and Hose Company (approx. half a mile away); Camden & Amboy Railroad (approx. half a mile away); City of South Amboy (approx. half a mile away); Old St. Marys High School (approx. 0.6 miles away). Touch for a list and map of all markers in South Amboy.
Credits. This page was last revised on February 8, 2026. It was originally submitted on April 15, 2016, by Don Morfe of Baltimore, Maryland. This page has been viewed 2,124 times since then and 101 times this year. Photos: 1, 2, 3. submitted on April 15, 2016, by Don Morfe of Baltimore, Maryland. 4. submitted on March 5, 2024, by David Weintraub of Edison, New Jersey. • Bill Pfingsten was the editor who published this page.



