The three gorges dam is having problems on its own. Chinese concrete is crap. Corruption in China is rampant. You can find videos of Chinese buildings collapsing or someone breaking the rebar with their hands. If there even is rebar in it. 20 year old Chinese concrete buildings crumbling away. The Chinese produce crap. All command and control economies do.
I have heard that it will cause flooding downstream when it fails, especially if all at once. Saw satellite photos in time lapse a while back that appeared to show some structural buckling. Jeepers.