According to his reckoning it was 2.45 when the stones in the centre of the dam began to sink because of the undermining, and within eight minutes a gap of twenty feet was made in the lower half of the wall face, through which the water poured as though forced by machinery of stupendous power. By 3 o’clock the toppling masonry, which before had partaken somewhat of the form of an arch, fell in, and then the remainder of the wall opened outward like twin gates, and the great storage lake was foaming and thundering down the valley of the Conemaugh.
Webber became so awestruck at the catastrophe that he declares he was unable to leave the spot until the lake had fallen so low that it showed bottom fifty feet below him. How long a time elapsed he says he does not know before he recovered sufficient power of observation to notice this, but he does not think that more than five minutes passed. Webber says that had the dam been repaired after the spring freshet of 1888 the disaster would not have occurred. Had it been given ordinary attention in the spring of 1887 the probabilities are that thousands of lives would have been saved.
Imagine, if you can, a solid piece of ground, thirty-five feet wide and over one hundred feet high, and then, again, that a space of two hundred feet is cut out of it, through which is rushing over seven hundred acres of water, and you can have only a faint conception of the terrible force of the blow that came upon the people of this vicinity like a clap of thunder out of a clear sky. It was irresistible in its power and carried everything before it. After seeing the lake and the opening through the dam it can be readily understood how that out-break came to be so destructive in its character.
The lake had been leaking, and a couple of Italians were at work just over the point where the break occurred, and in an instant, without warning, it gave way and they went down in the whirling mass of water, and were swept into eternity.
Mr. Crouse, proprietor of the South Fork Fishing Club Hotel, says: “When the dam of Conemaugh lake broke the water seemed to leap, scarcely touching the ground. It bounded down the valley, crashing and roaring, carrying everything before it. For a mile its front seemed like a solid wall twenty feet high.” The only warning given to Johnstown was sent from South Fork village by Freight Agent Dechert. When the great wall that held the body of water began to crumble at the top he sent a message begging the people of Johnstown for God’s sake to take to the hills. He reports no serious accidents at South Fork.
Richard Davis ran to Prospect Hill when the water raised. As to Mr. Dechert’s message, he says just such have been sent down at each flood since the lake was made. The warning so often proved useless that little attention was paid to it this time. “I cannot describe the mad rush,” he said. “At first it looked like dust. That must have been the spray. I could see houses going down before it like a child’s play blocks set on edge in a row. As it came nearer I could see houses totter for a moment, then rise and the next moment be crushed like egg shells, against each other.”
Mr. John G. Parke, of Philadelphia, a civil engineer, was at the dam superintending some improvements in the drainage system at the lake. He did all he could with the help of a gang of laborers to avert the catastrophe and to warn those in danger. His story of the calamity is this:—
“For several days prior to the breaking of the dam, storm after storm swept over the mountains and flooded every creek and rivulet. The waters from these varied sources flowed into the lake, which finally was not able to stand the pressure forced upon it. Friday morning I realized the danger that was threatened, and although from that time until three o’clock every human effort was made to prevent a flood, they were of no avail. When I at last found that the dam was bound to go, I started out to tell the people, and by twelve o’clock everybody in the Conemaugh region did or should have known of their danger. Three hours later my gravest fears were more than realized. It is an erroneous idea, however, that the dam burst. It simply moved away. The water gradually ate into the embankment until there was nothing left but a frail bulwark of wood. This finally split asunder and sent the waters howling down the mountains.”