Carrapatelo Dam (Portuguese: Barragem do Carrapatelo) is a concrete gravity dam on the Douro, where the river forms the borderline between the districts of Porto and Viseu.

The spillway is part of the dam body (maximum discharge 22,000[2] m³/s).

[1] The run-of-the-river hydroelectric power plant went operational in 1971.

The power station contains 3 Kaplan turbine-generators with 63.4 MW each in a dam powerhouse.

The turbines were provided by Kværner, the generators by Brown, Boveri & Cie.[4] On the right side of the dam is a lock, which can handle ships with the following maximum properties: 83 m in length, 11.40 m on the beam, 3.8 m load-draught and a cargo capacity of 2500 tons.