The 20 years old arch dam Foum Gleita lies in the southern part of Mauritania on the river Gorgol Noir. The height of the dam is 45 m. Concerns of the Ministry for Rural Development and Environment of the Islamic Republic of Mauritania represented by the National Society for Rural Development (SONADER) on the safety of the habitants downstream and the long term provision of irrigation water from the reservoir led to a stability and safety assessment study. Results of the study are presented in this paper.