The autumn evening of September 17, 1930, descended on Mukilteo with deceptive tranquility, the setting sun casting long shadows across Powder Mill Gulch where 65 tons of high explosives lay stored in wooden sheds. For 24 years, the town had lived with this sleeping giant at its doorstep, home to the dangerous alchemy of volatile ingredients that cleared forests, carved railroad passages, and built the region’s future, one “Kick in Every Stick” at a time. It was a precarious peace that felt permanent until it wasn’t. At 5:50 p.m., just past quitting time, the ground heaved as the sleeping giant woke in a roar of heat and light, shattering the stillness and forever changing the face of the coastal town.
The Origins of the Powder Mill: A Foundation Built on Volatility
Founded in 1906, the Puget Sound and Alaska Powder Company operated its mill in a deep gulch near the Everett-Mukilteo border. It was an industry born of necessity in the Pacific Northwest, and for decades the plant was a cornerstone of the Snohomish community, employing between 30 and 50 men. Its primary output, Vulcan dynamite, was essential to the rugged work of the Pacific Northwest, acting as the unrelenting force that cleared massive stumps from timberlands, carved mountain passes for the Great Northern Railway, and opened mines deep in the Cascades.
By 1930, the factory was producing a staggering 400,000 pounds of dynamite monthly. While the residents of Mukilteo were well aware of the volatile neighbor in the ravine, the plant had operated safely for nearly a quarter-century. The danger had become a backdrop to daily life, an accepted risk that helped build the region’s prosperity. However, as the nation slid into the hardships of the Great Depression, cost-cutting measures inside the mill began to brew a recipe for disaster.
A Fatal Spark: Cost-Cutting Causes Spontaneous Combustion
The catastrophe’s origin lay not in fate, but in a decision to cut costs. In an effort to economize, plant manager W. E. Crosby had recently altered the factory’s safety protocols. First came the dilution to their dynamite formula, replacing expensive nitroglycerin with ammonium powder until the sticks lost their reliable kick, creating a stockpile of failed explosives that customers returned in frustration. The original safety protocol, which demanded that these failures be swept into sacks and burned at the shore, was wasteful but safe. But as the Depression tightened its grip and profit margins thinned, workers were ordered to salvage even the spillage, screening and reusing the ammonium mixture that had fallen to the wooden floors. What the company didn’t understand was that this recycled powder, having absorbed moisture from Puget Sound’s damp air, had transformed into something far more volatile than the original formula.
As evening approached on September 17, most workers had already departed for their homes in Mukilteo and Everett, leaving only three men to complete the day’s final tasks. Among them was Clarence Newman, tasked with cleaning up accumulated waste in the ammonium drying house. As he scraped the damp, recycled powder across a screen, the particles spontaneously combusted. Sparks flew. With no fire extinguisher in the building and only Powder Mill Creek as a water source, Newman quickly realized he could not contain the blaze. His only recourse was to dash from the building, shouting warnings to the two other men still on the site.
All three escaped unharmed as flames raced up the ammonia-impregnated wooden walls. Understanding instantly that the fire was beyond any hope of containment, their only recourse was to ignite a different kind of chain reaction, one of urgent warning. They rushed to spread the word, each neighbor alerting the next that the mill was ablaze and an explosion was imminent.
Up in Flames: Twin Thunders Shake the Sound
At approximately 6 p.m., the first explosion erupted when fire reached the nitroglycerin house. Nine thousand gallons of the combustible liquid detonated simultaneously, creating a blast that transformed the peaceful evening into chaos. Witnesses later described seeing a pillar of dark smoke rising from the gulch, followed by a yellowish-gray mushroom cloud that bloomed against the twilight sky visible for miles in every direction.
The shock wave rippled outward with devastating force; the immediate physical damage was both widespread and intensely personal. The shockwave hitting the harbor created a massive, sudden ebb, lifting boats from the water. One vessel was reportedly blown 20 feet into the air by the concussive force. On land, the concussion shattered windows in downtown Everett businesses over four miles away and damaged nearly every nearby home in Mukilteo. Flying glass became a primary cause of injury. At least eight people were hurt by debris; most tragically, a teenage girl lost an eye to a shard, and another woman suffered a severe cut to her jugular vein. Dr. Claude Chandler, Mukilteo’s local physician, provided urgent first aid in his drugstore before the more seriously injured were transported to Providence Hospital in Everett.
Before the echo of the first blast could fade, a second thunderous roar erupted from the gulch as 100 cases of stump-blasting powder ignited, adding its voice to the destruction. The concussions were so powerful that they rattled the region’s infrastructure, bringing train service to an abrupt halt and severing communication lines across the region as telephone poles snapped in half. When the air cleared, the industrial heart of the Puget Sound and Alaska Powder Company was gone. The office, gelatin house, packing house, boiler house, and nitro house were all completely obliterated.
Fire crews responded swiftly, driven by the fear that the fire would spread to the primary storage magazines. They managed to hold the line and prevent a greater catastrophe. As they worked, the road to the gulch became blocked not by official cordons, but by a jam of residents whose curiosity overpowered caution, all hoping for a view of the destruction.
Aftermath of the Blast and Echoes in the Overgrowth
In the cold light of the following day, the “lucky” reality that no one had been killed was tempered by a staggering financial ruin. The disaster left behind a half-million-dollar path of destruction—a massive sum as the Great Depression loomed overhead. While the plant itself accounted for half that figure, the other $250,000 fell on private homeowners and local businesses. In a final, cruel twist, many residents discovered their insurance policies didn’t cover “acts of explosion.” Left with buckled foundations and shattered livelihoods, many were forced to file claims against a company that had quite literally vanished in a cloud of smoke.
Following the disaster, company president Peter David pledged to reconstruct the plant at Powder Mill Gulch. His plans met with forceful opposition from a community that had just witnessed the facility’s destructive potential, and the objections prevailed. Though various development proposals have surfaced over the decades, the site has remained largely untouched. Today, the forest has reclaimed what industry lost, burying the mill’s scars under a thick, green shroud of brush and trees. The only surviving remnant is an unassuming blue street sign on Mukilteo Boulevard, a quiet marker hinting at the gulch’s explosive past.
