Currently, after the building of various dams, the river is navigable, smoothly and calmly, for 210 km, between Oporto and Barca d´Alva.
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Young winemakers look at the river and think they can suck a bit of water out of it and there will be plenty behind it, but it's a series of lakes and it doesn't replenish. Last September the source of the Douro in Spain dried up for the first time.