This paper discusses the engineering geological investigations, engineering properties of the rock mass at the dam site, and construction materials for the dam embankment. Kandil Dam is located in Kahramanmaras southeastern Turkey. It is used for energy production and water storage for irrigation. Engineering geological mapping, analysis of the discontinuity system, drilling, trial pitting, Lugeon water pressure tests and laboratory tests were undertaken. As a result of site survey and test results, three pervious and one impervious material quarries were identified. Rock mass classifications were performed in accordance with Rock Mass Rating (RMR) systems for the diversion tunnel. Bedrock in the foundation consists of amphibolites rated by the RMR method as "good rock". Based on evaluation of the site and laboratory data, two different quarries were selected for embankment fill materials. In addition, one impervious material quarry was located for cofferdam construction.