SierraRios has a series of 14-day raft/kayak expeditions planned on the Grande-Colorado with departures Dec14, Jan4, Jan24, and Feb10. Join a trip and see the whole river before construction of the Portazuelo del Viento dam begins next year!  There is still a chance the project will be stalled or blocked, especially with the financial difficulties in the country currently.  Check out the video of the trip in Dec2016:  https://vimeo.com/206639524