Porce III hydroelectric development is currently under design and it includes a 146 m high RCC dam, which by the time of construction would be the fourth RCC dam built in Colombia and the second in the hydrological basin of Porce river. The dam will be located in a hot and rainy region of the northwestern part of the country. In the first part of this document, a discussion about the foundation requirements is presented. In the second part, a description of the most outstanding technical design features is given; among these features, the mix