The 2-D stress-strain state analyses of Boguchansk concrete dam was performed using ADINA program with various models of concrete and rock foundation: elastic, ideally elasto-plastic with Mohr-Column criterion and nonlinear brittle models. The main properties of the nonlinear brittle model with strength softening of concrete and rock foundation were considered. The stress-strain state of dam sections under actions of hydrostatic and uplift pressures was analyzed and assessed as a favorable, but severe cold winter temperatures can transfer the dam state into unfavorable.