The results of studies of the superficial and stratified sediments in the protected karst lakes located in the Zelenodolsk District of theRepublicofTatarstanare reported. The studies showed that the key quantitative parameters of sedimentation in the lakes have remained identical in the last 300 years. The indices of annual accumulation of suspended material in the lakes are proportional to their water table area. The current rate of sedimentation in the lake system is 1.4 mm/year. The trend for an increase in the nutrient load on the lakes is manifest in a notable increase in the content of organic matter, nitrogen and phosphorus compounds in superficial sediments.