ABSTRACT. - Monitoring of Construction Behaviour of the Leşu Storage Lake.The paper follows the behavior in time of barrage of Leşu reservoir. It is focused on surveillance and monitoring system and presents the events that took place in the life time of hydrotechnical work. In the same time, recommendations for actions to be taken increasing the level of confidence in exploitation, are made
Key-words: storage lake, surveillance system, warning criteria, Leşu.