ABSTRACT: Çambaşı dam, site is located on `the river of Solaklı, 7 km south of Çaykara town in `the province of Trabzon. Foundation rock of the dam site is metabasalt. In this investigation, lithological, structural, physical., mechanical and. elastic properties of this metabasalt have been determined on the basis of field and laboratory works. Using the results obtained from the field, and. laboratory investigations, the metabasalt has been classified for various engineering purposes. According to these classifications, it is generally medium and well in quality, densely jointed, low in porosity, stiff .and very stiff, semi and. poorly permeable, higiy and extremely strong and average modulus ratio. In edition, the discontinuities in the metabasalt arc intermediately and vide apeitured, and their surfaces are sligth and medium in roughness. There are generally linear relations among physical, mechanical and elastic characteristics of the metabasalt. Maximum anisottopy values computed through these properties show that it can be accepted as isotropic in nature.