I’ve always been interested in engineering failures, especially after reading Henry Petroski, who argues that we often learn more from failures than from successes. Dams made of earth have always seemed risky to me, so when I watched a detailed video about the Teton Dam collapse by the YouTube channel Practical Engineering, I wanted to learn more. That led me to another disaster—the failure of the Taum Sauk Dam. Both dams had actually won awards for their design, yet both still failed. In the end, these events showed how important it is to truly understand the ground beneath a structure. It’s hard not to think of the RMS Titanic sinking as another example of overconfidence leading to catastrophe.
There isn’t a lot of easy-to-find information about these failures beyond firsthand accounts and long government reports. Still, what is clear is that these disasters were not random accidents. They were caused by human mistakes—lack of knowledge, poor judgment, and sometimes carelessness. Rather than disproving the idea that we learn from failure, they actually support it. Success can make people overconfident, which can lead to failure. But once a failure happens and people study it, they often improve and do better next time.
The history of civil engineering is full of stories like this. Often, major advances come only after something goes terribly wrong. The collapse of the Teton Dam in 1976 and the failure of the Taum Sauk reservoir in 2005 are two examples. They happened in very different places—Idaho and Missouri—and nearly 30 years apart, but they share a key similarity: both failures came from a misunderstanding of the land they were built on, combined with pressure to move forward despite warning signs.
At Teton, political pressure during the Cold War era pushed the project forward, and engineers trusted their usual design methods too much. At Taum Sauk, the problem came from a modern push for profits in the energy market, along with growing neglect of maintenance systems. In both cases, safety concerns were overlooked.
These disasters show that failure usually isn’t caused by just one mistake. Instead, it’s the result of several problems happening at once—wrong assumptions, financial pressures, and ignored warnings all lining up. Even though the exact technical causes were different, the bigger issue was the same: poor oversight and a false sense of confidence.
A major problem in both cases was misunderstanding the ground beneath the dams. At Taum Sauk, the rock looked extremely strong, which gave engineers a sense of security. But beneath the surface were weaker, weathered layers that weren’t properly removed during construction. Over time, this caused the structure to shift and settle in dangerous ways.
Something similar happened at Teton. Engineers built the dam on porous volcanic rock that allowed water to move through it. They believed their design could handle it, but they underestimated how easily water could seep through and weaken the structure. In both cases, engineers trusted their designs more than they respected the natural conditions of the site.
There were also organizational problems. At Teton, the design team and construction team didn’t communicate well, leading to a design that didn’t match real conditions. At Taum Sauk, warning signs—like ongoing water leaks—were treated as normal operating issues instead of serious problems. In both cases, efficiency and cost-saving took priority over safety.
The way the dams were operated also made things worse. At Taum Sauk, demand for electricity led to the reservoir being used far more often than originally planned. Monitoring systems were unreliable, but repairs were delayed. At Teton, the reservoir was filled much faster than recommended, even though the dam hadn’t been fully tested.
Political and financial pressures played a big role too. The Teton Dam project was tied to political campaigns and funding battles, which led to rushed decisions. At Taum Sauk, company profits depended on keeping the facility running at high capacity, which encouraged risky behavior.
When the failures finally happened, they unfolded quickly and dramatically. At Teton, water began leaking through the dam and eroding it from the inside. Within hours, the structure collapsed, sending a massive flood downstream. At Taum Sauk, water spilled over the top of the dam, rapidly washing away the structure in just minutes.
The consequences were severe. The Teton collapse killed people, destroyed homes, and caused billions of dollars in damage. The Taum Sauk failure caused massive environmental damage but, fortunately, resulted in far fewer injuries due to the timing and location.
Afterward, both disasters led to important changes. Regulations became stricter, and safety oversight improved. At Taum Sauk, for example, authorities imposed heavy fines and required stronger safety systems. The dam was rebuilt using a more solid design that reduced the risks seen in the original structure.
Today, these events serve as powerful reminders. Engineering can accomplish incredible things, but it must always respect the limits set by nature. These failures weren’t just about materials or design—they were also about communication, decision-making, and the willingness to listen to warnings.
In the end, the lesson is simple: no matter how advanced our technology becomes, success depends on understanding the world we build on. If we ignore that, failure is only a matter of time.
References:
[1] Petroski, H. (1994). To engineer is human: The role of failure in successful design. My review from 2008: https://www.goodreads.com/review/show/39682053
[2] Practical Engineering. The Wild Story of the Teton Dam Failure. https://www.youtube.com/watch?v=J7ieKmP96Hc
[3] East Idaho News. Remembering the Teton Dam collapse: Inside the failure and fight to rebuild. (n.d.). YouTube. https://www.youtube.com/watch?v=W90TNxd8g54&t=5s
Hilf, J. W. (1987). The wet seam and the Teton dam failure. Engineering Geology, 24(1-4), 265-281. https://doi.org/10.1016/0013-7952(87)90067-6
[4] Petroski, H. (2018). Success through failure: The paradox of design. Princeton University Press.
[5] Practical Engineering. The Wild Story of the Taum Sauk Dam Failure. https://www.youtube.com/watch?v=zRM2AnwNY20
Rogers, J. David. The 2005 upper Taum Sauk Dam failure: A case history. September 2010 Environmental and Engineering Geoscience 16(3):257-289 DOI:10.2113/gseegeosci.16.3.257
Sherard, J. L. (1987). Lessons from the Teton dam failure. Engineering Geology, 24(1-4), 239-256. https://doi.org/10.1016/0013-7952(87)90064-0
Watkins, Conor M. "Overview of the Taum Sauk Pumped Storage Power Plant Upper Reservoir Failure." https://damfailures.org/sites/default/files/wp-content/uploads/2015/07/087_Overview-of-the-Taum-Sauk-Pumped-Storage-Power-Plant-Upper-Reservoir-Failure.pdf
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