How long are dams like Hoover Dam engineered to last?

For those who wanted the answer to the title in these comments, paraphrased it was: with proper maintenance, indefinitely. read more

Just so we can put this on a scientific basis, the International Commission on Large Dams (ICOLD) defines a large dam as one more than 15 meters tall or impounding (i.e., holding back) more than a million cubic meters of water; there are more than 39,000 such dams worldwide. read more

> The write-up is in response to a question asking how long dams like the Hoover Dam, which is a large concrete dam, are designed to last. It wasn't suggesting that all dams are concrete. But the author mixes concrete dams with tailings dams, of which none (according to USACE) are concrete. read more

Major Dams are normally designed for 100 years. Reservoir live capacity and dead storage for silting are also designed accordingly. read more