The Three Gorges Dam really did 'cut off the clouds and rain of Mount Wu.'
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history
From Mao Zedong's 1956 《水调歌头·游泳》: 更立西江石壁,截断巫山云雨,高峡出平湖。神女应无恙,当惊世界殊. It imagined the Three Gorges Dam (filled in 2003) more than sixty years early. 巫山云雨 originally alludes to the King of Chu's dream of the goddess in Song Yu's 《高唐赋》; here it is reworked to mean the literal clouds and rain of the Yangtze gorges.
usage
巫山云雨 in classical literature alludes to a romantic tryst (the King of Chu meeting the Wushan goddess in a dream). Mao strips the allusion and takes only the literal sense. Watch the context when quoting it.