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Last summer, we looked at the devastating effects of flooding when we discussed the failure of the Lawn Lake Dam in Rocky Mountain National Park. Three people were killed, millions of dollars in property was destroyed, and the Park was left indelibly marked. But that failure, occurring at 11,000′ above sea level, was actually pretty small in both size and effect when compared with the subject of Today’s History Lesson.
On May 30, 1889, torrential rains fell over western Pennsylvania. In a 24-hour period, the area received as much as 10″ inches of rain. Most of us know that those kinds of rains cause instant flooding, as rivers and streams simply cannot handle that kind of run-off and the rain falls too quickly to be absorbed into the ground. This storm was no exception. Towns like South Fork and Johnstown, Pennsylvania were simply swamped with water that, in places, ran 10 feet deep. But worse was to come…much worse.
Fourteen miles upstream sat the South Fork Hunting and Fishing Club, an exclusive resort area. Purchased 10 years prior, it had been developed into a refuge for Pittsburgh’s wealthiest residents. The centerpiece of the resort was Lake Conemaugh, a man-made lake held in place by the South Fork Dam…until May 31, 1889.
Nearly a foot of rain from all over western Pennsylvania overwhelmed the lake’s supporting dam and, despite efforts to relieve the pressure, the South Fork Dam failed just after 3:00pm. When we discussed Lawn Lake, we said that 218 million gallons poured down the mountain toward Estes Park. The South Fork Dam released an estimated 4.8 billion gallons of water. That’s 22 gallons of water for every gallon that left Lawn Lake. And what’s more, 4.8 billion gallons of water poured into an area that was already heavily flooded.
The first town of South Fork, because it sat on higher ground, was spared the worst. The next town, Mineral Point, was razed to bare rock. An hour after the dam collapsed, this new flood, carrying with it part of bridges, huge rocks, trees, an homes from upstream, slammed into Johnstown with waves up to 60 feet high and speeds of 40 miles per hour.
The town became a seething death trap of water, mud, and debris. Of course, none of us was alive to witness the event or see the aftermath, but the photos that remain show utter destruction. There has never been an exact count of the lives lost, but more than 2,200 is sure. The cleanup efforts lasted for years.
Johnstown, PA, has certainly seen its share of terrible flooding in the years since 1889. But mentioning “the Johnstown Flood” in knowledgeable company brings just one event into focus.
Recommended Reading: The Johnstown Flood – Another of McCullough’s fabulous works. The guy simply cannot produce bad literature.