Ruins of a World War I Munitions Disaster
Camillus, NY
Research updated June 2026
Age
All Ages (parental judgment recommended)
Cost
Free
Free public access; the site is informally visited but not formally maintained.
Access
Limited Access
Rough quarry rim, rubble, brush trails, exposed concrete and rebar
Equipment
Photos OK
Est. 1915 · World War I Home Front · American Industrial Disasters · Solvay Process Company History
Split Rock Quarry began as a limestone extraction operation feeding the Solvay Process plant in nearby Geddes, where Belgian-derived industrial chemistry produced soda ash for glass and detergent manufacturing. The quarry was operated by the Solvay Process Company and its affiliates during the late nineteenth and early twentieth centuries, and the site included rail spurs, rock crushing machinery, and a network of support buildings.
With the United States' entry into World War I in 1917, the Semet-Solvay Company expanded the site into a major munitions plant under federal contract. By 1918 the Split Rock works employed approximately 2,500 people and reportedly produced as much as a quarter of the country's explosives, including the picric acid and TNT shipped to Allied forces in Belgium and France.
On the evening of July 2, 1918, fire broke out in the main TNT building, reportedly after a mixing motor overheated. Industrial fire suppression at the time relied on rubber hose, which failed as flames spread. A series of explosions tore through the plant. Approximately 600 men were working the 3-to-11 p.m. shift; approximately 50 died. Fifteen of the dead were burned beyond recognition and were buried in a common grave; more than twenty were reported missing and presumed killed. Ten buildings were destroyed, and property losses approached one million 1918 dollars.
The plant closed permanently on December 31, 1918, weeks after the November armistice. Quarrying continued at reduced scale for years, but the ruins of the munitions works were left in place. The skeletal frame of the rock crusher and several concrete foundations remain visible today, and the site is accessible as informal open space along Split Rock Road in the town of Camillus. The Onondaga Historical Association and Atlas Obscura have documented the disaster, and a Find a Grave memorial commemorates the workers killed in the explosion.
Sources
The paranormal lore at Split Rock Quarry is grounded in the documented loss of life on July 2, 1918, and the persistence of the ruins themselves. Visitors describe figures, sometimes glowing faintly in shades of green and yellow, moving along the rim of the quarry or standing on the skeletal remains of the rock crusher. The greenish tint reported in some accounts is often tied locally to the picric acid that historically stained workers' skin and clothing during munitions production.
Additional reports describe a low humming sound that visitors interpret as the crushing equipment continuing to run, and unexplained tapping or footsteps in the surviving tunnel sections behind the crusher. As with most industrial-ruin sites, atmospheric explanations including wind through concrete openings, settling debris, and the natural acoustics of quarry walls account for many reports.
The site appears on the Haunted History Trail of New York State and has been profiled in regional ghost-story collections. Investigators have collected EVP recordings and reported equipment battery drain. The combination of documented mass-casualty history, surviving industrial architecture, and unfenced wilderness access has made Split Rock Quarry one of the more frequently visited informal dark-tourism sites in central New York.
Visitors should keep in mind that the site is genuinely dangerous in places, with steep quarry edges, exposed rebar, and unstable rubble. The ruins also remain a working memorial to the workers killed in 1918, and respectful visitation is appropriate.
Hike the rim of the abandoned limestone quarry west of Syracuse and observe the surviving concrete ruins of the Semet-Solvay TNT plant that exploded on July 2, 1918, killing approximately 50 workers. The skeletal rock crusher and foundation remnants remain visible from the quarry trails. Footing is uneven and unprotected; wear sturdy boots and stay back from quarry edges.
Every HauntBound history is researched from documented sources. We clearly separate verified historical fact from paranormal folklore.
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