Oakdale in Allegheny County, Pennsylvania — The American Northeast (Mid-Atlantic)
The Panhandle Trail
The Aetna Chemical Explosion
Throughout World War I, American companies worked to meet wartime demand for weapons, The Aetna Chemical Company was established to manufacture munitions for the allied powers. Local manufacturing plants were erected in nearby Noblestown, Carnegie and Oakdale.
Constructed in 1915, the Oakdale plant, situated less than a mile south of here, eventually employed over 450 in the production of TNT and various other wartime chemicals. France alone ordered three quarters of its explosives from Aetna.
On the afternoon of May 18, 1918 with wartime production and patriotism at its peak, the TNT Building on the grounds of the Oakdale plant suffered a devastating explosion. Bystanders from Oakdale ran into the flames to rescue those who were trapped, only to be caught in subsequent explosions.
In Oakdale Cemetery, a monument was dedicated to the two hundred victims who "like soldiers, they died in their country's service."
Among those killed was Kirven Lawhon, a sixteen year old who had quit his position the previous day. Preparing to leave Oakdale for a safer job in Ohio, he ran to the plant to help after the first explosion.
At 66, James Keenan did the same. Several days after the blast, he would be identified through personal effects found near his remains.
Marlyn Ashelman, a young nurse from Pittsburgh, survived the explosion as she lent aid but lost a portion of her leg when it was severed by a steel girder.
Following a lengthy investigation, government officials determined that the cause of the explosion was human error and not sabotage as originally suspected.
(Captions):
James Keenan Kirven Lawhon Marlyn Ashelman
James Keenan's personal effects
Kirven Lawhon's mother received word of his death by telegram. In her own handwriting, she noted how long her boy had been away from home.
A granite memorial marks the mass grave at Oakdale Cemetery.
The steel skeleton of the massive TNT building remained standing after several powerful explosions.
Erected by Industrial Scientific, The West Allegheny Foundation and local businesses and individuals.
Topics. This historical marker is listed in these topic lists: Disasters • Industry & Commerce • War, World I. A significant historical date for this entry is May 18, 1918.
Location. 40° 23.835′ N, 80° 11.084′ W. Marker is in Oakdale, Pennsylvania, in Allegheny County. It is at the intersection of Union Avenue (Pennsylvania Route 978) and Willow Avenue when traveling north on Union Avenue. Marker is located on the Panhandle (bicycle and walking) Trail. Touch for map. Marker is at or near this postal address: 5 Willow Avenue, Oakdale PA 15071, United States of America. Touch for directions.
Regionally, this marker is in Greater Pittsburgh. It is also in the American Northeast, in the Mid-Atlantic, in the Ohio River Valley, in Appalachia, and specifically in Northern Appalachia. Globally, it is in North America, the Western Hemisphere, the Western World, and the Anglosphere. Historically, it finds itself in what was once the Viceroyalty of New France, the Haudenosaunee (Iroquois) Confederacy, and one of the original Thirteen Colonies.
Other nearby markers. At least 8 other markers are within 3 miles of this marker, measured as the crow flies: Oakdale Honor Roll (within shouting distance of this marker); W.J. Stewart / Howard Stewart House (approx. 0.2 miles away); Aetna Chemical Company Memorial
(approx. 0.6 miles away); Noblestown Honor Roll (approx. 0.9 miles away); Walker-Ewing Log House (approx. 1.6 miles away); Sturgeon Honor Roll (approx. 1.7 miles away); Elizabeth Gilmore (approx. 2.1 miles away); The Soldier's Monument (approx. 2.1 miles away). Touch for a list and map of all markers in Oakdale.
Credits. This page was last revised on June 8, 2025. It was originally submitted on June 7, 2025, by Bradley Owen of Morgantown, West Virginia. This page has been viewed 423 times since then and 172 times this year. Photos: 1, 2. submitted on June 7, 2025, by Bradley Owen of Morgantown, West Virginia. 3. submitted on June 8, 2025, by Bradley Owen of Morgantown, West Virginia.


