Tom O'Day becomes engaged to Gloria Hamilton, daughter of wealthy logging magnate John Hamilton, and makes plans to marry her while her father is away in Pittsburgh. Anna Burger, a workman's daughter, has unrequited love for Tom. One of the lumber camps owned by John Hamilton sits upriver of Johnstown, Pennsylvania. To satisfy lumber contracts, Hamilton's crews clear as many trees as possible and keep the water level behind the dam at maximum capacity to float them to the mill. When O'Day warns Hamilton that the impounding of water is weakening the dam, Hamilton scoffs and refuses to stop logging until a consortium of townspeople intervenes and convince him to hire a state inspector to look at the issue.
Shortly after the meeting Hamilton receives a message that "Ajax Construction" heard he'd suspended operations and plans to have their lumber contract fulfilled elsewhere, prompting Hamilton to hire men to takeover and hold the dam so that he may continue business. The men hold the dam, even shooting at a concerned mob of townspeople attempting to retake the site.
As Tom and Gloria's wedding begins a cloudburst rips the dam apart, sending a cascade of floodwater and logs towards Johnstown. Anna Burger, who was on her way to see Tom via horse, begins to ride through town as fast as possible to warn all of the inhabitants about the flood.
Anna makes it to the church before the flood hits it, allowing many wedding goers to escape. The train carrying Gloria's father back to Johnstown is impacted by a trestle destroyed by debris and fire, killing many.
Though Tom and Gloria escape the church together, he is driven to find Anna but is too late & discovers her body in the building's wreckage.
The closing title card reads 'Toil overcame desolation and Johnstown was rebuilt anew' just before a few shots showing citizens getting back to their lives.
Film historianRobert A. Harris considers the film remarkable for its time, because of the vivid way it recreated the flood, saying: "The importance of The Johnstown Flood to film history is difficult to overstate. The special effects of the film combine miniatures and sets to depict the actual historic event of flood and its aftermath, pioneering complex techniques. It was the Star Wars of its day."[3]
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