Summary:

In the paper the results of carried out technical state and safety opinion of hydro- engineering structure “Bobrowice I” on the Bóbr river were presented. The attention have been paid on the structure exploitation conditions and capacity ability of the weir and the bottom outlet. Problem of sedimentation of the upper reservoir was considered. It was suggested that not every the safety limit is the technical state of the main structure such as weir or the dam. Sometimes its limit are determining by quite different conditions such as lack of possibilities to open the bottom outlet or carrying out reconditioning works on the structure. The influence of such situation on the safety of structure and potential treatment on the ground lying below, was underlined.