In this thesis a 3D reservoir geomechanics model (mechanical earth model) is constructed for the FORGE laboratory site near Milford, Utah. Such characterizations are necessary for enhanced geothermal sites (EGS) that rely chiefly on shear stimulation for permeability increases. 1D mechanical earth models are constructed along wells and distributed through 3D structural models populated with simulation grids. Stresses are estimated from a variety of sources and developed into 3D models. A discrete fracture network is built using outcrop data and well bore image log data.