Three Gorges Dam, and both China and likely India have even bigger projects on the books that look positively insane:

China’s plans for gigantic Brahmaputra dam strains relations with India further

Powerchina’s announcement it will build a mega dam could spur a dam-building race with India, with disastrous consequences for the ecology of the region

https://www.thethirdpole.net/en/regional-cooperation/chinas-plans-for-gigantic-brahmaputra-dam-strains-relations-with-india-further/

I don't have a source handy, but it's been claimed that Three Gorges Dam is so heavy and vast that it has slightly perturbed the rotation of the earth. It's humungus, relatively new, and already shows preliminary signs of architectural strain in satellite photos.