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Powerful gears and chain lower the lock gates at the river lock in the Douro valley

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Powerful gears and chain lower the lock gates at the river lock in the Douro valley

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Lock gates slowly drop under the water at Barragem do Carrapatelo dam and lock on the Douro river near Porto

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River cruise boat sailing towards the lock gates of the Pocinho dam on the River Douro in Portugal

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River cruise boat sailing towards the closed lock gates of the Pocinho dam on the River Douro in Portugal

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River cruise boat waits as the lock gates drop below the water surface of the Pocinho dam on the River Douro in Portugal

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Closer view of Barragem do Pocinho dam as the lock fills with water ready for the descent

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River cruise boat slowly enters the lock of the Pocinho dam on the River Douro in Portugal

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River cruise boat slowly enters the lock of the Pocinho dam on the River Douro in Portugal

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River cruise boat slowly leaving the lock of the Pocinho dam on the River Douro in Portugal

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View upwards inside the very deep lock of the Carrapatelo dam on River Douro in Portugal

Alexpunker
Gateway on the river. Sluice Gates.