The unintended dam became engulfed in flames creating a 70’ high wall that had to eventually be blasted away after waters receded. Spreading across the city the floodwaters washed back and forth forcing debris against the PRR stone viaduct near the Cambria Iron Works creating further peril during the situation. Flood waters tore through the center of Johnstown which is hemmed in by the Stoney Creek and Conemaugh Rivers on the the valley floor becoming the epicenter of disaster. The flood entered town in the areas of East Conemaugh and Woodvale leveling rail yards, tossing passenger trains and causing major damage to the Gautier Iron Works, picking up even more debris including barbed wire manufactured at the mills. Flood maps for other places called Stone. There maybe other points within the postcode which fall into a different area, and hence have a different risk level. By the time it hit Johnstown the wall of floodwater was estimated to be 60’ high in places and traveling at 40 miles per hour. Map of Stone (Aylesbury, Buckinghamshire) flood risk areas, which includes areas of high, medium, and low flood risk, plotted on a Stone flood map. Taking approximately 40 minutes to drain the lake, flood waters raged through the valley taking less than an hour to reach the city of Johnstown, picking up houses, trees and even a railroad viaduct in its course. Winterfold flood map: 2.2 km: Aggborough flood map: 2.4 km: Hoobrook flood map: 2.5 km: Hurcott flood map: 2.8 km: Hurcott Village flood map: 2.8 km: Greenhill flood map: 2. The dam holding back Lake Conemaugh collapsed, releasing some 20 million tons of water into the Conemaugh River valley. By the afternoon of May 31st, Johnstown was already experiencing flooding in various areas but at approximately 3:10PM the situation grew far beyond what anyone could have ever imagined.
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