The purpose of this study was to test Kanter's Theory (1977, 1993) of Structural Power in Organizations in a sample of Canadian critical care nurses. A secondary analysis of data from a larger descriptive correlational survey design was used to examine the relationships between perceived empowerment, perceived magnet hospital traits and critical care nurses' mental health (n = 75). The instruments in this study included the Conditions for Work Effectiveness Questionnaire II, the Job Activities Scale II, the Organizational Relationship Scale II, the Nurses Work Index-Revised, the Emotional Exhaustion Subscale, and the State of Mind Subscale. Empowerment was significantly and positively related to perceptions of magnet hospital traits (r = .49, p = 0.001). The combination of empowerment and magnet hospital traits explained a significant amount of the variance in mental health indicators: burn-out (19%) and state of mind (12%).