2055265 t1_iwua3tb wrote
Reply to comment by Tigen13 in Study indicates flood events at dams will significantly increase over next 80 years due to out of date rainfall modelling and climate change. by unswsydney
~100 years
The Hoover dam is a bit of an outlier because it is such a large project. The larger the dam the longer the lifespan usually. If cracks in concrete are found they will attempt to fix them by draining the water level for a time. The Hoover dam also contains no rebar which helps a lot for longevity.
Without human intervention the dam would collapse in 3-5 years. With regular service to the turbines but no structural work I’d guess ~50 more years.
But again, the Hoover dam is a huge outlier. We have over 80,000 dams in the US. Most of these dams will be brought to the edge of their lifespan, torn down, and rebuilt rather than repaired or retrofitted.
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