Hi Darren,
Unfortunately the MaeKhong river has to be closed. It has been one of the world's great rivers and has served humans and animals for tens of thousands of years or more. But China needs that water for hydroelectricity, and so the river and the environments and villages it supports in Thailand, Laos, Cambodia and Vietnam - sorry for the inconvenience, but they will have to cease to exist.
Thanks for your interest. If you wish to make any comments on the matter please write to your local MP and post the letter somewhere on the planet Pluto - they'll be sure to get around to it in due course.
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A little less sarcastically, yeah, the river is really low this year due to the Chinese dams and low rainfall.
Usually by late April we get good rains, and so it is estimated that the slow boats will be operational by March.
But no guarantee - the world's weather patterns are changing, thanks to USA and friends and so ??? Oh - and the countries on the MaeKhong really haven't looked after the river either.
Don't worry - all the people that once were supported by the river, they can probably illegally migrate to China and get new jobs as illegal factory workers. And if you can't go down the river in March - there should be plenty of water in China's dams you could paddle about in.
Oops - I went all sarcastic again.