The Vigario and Santana reservoirs are part of the Paraiba do Sul basin which supply water to three hydroelectric plants integrated in Light s energy system, with a power generation capacity of 612 MW. Considering the increase in energy demand and supply, the operation of hydroelectric plants brings changes in the soil occupation profile, and consequently, impacts on the erosion rates. Under the circumstances, the original parameters related to the silting of the reservoir are no longer applicable, resulting in a shorter useful life than expected in the original projects. Among the alternatives for recovering historical data on the variation of the sedimentation velocity on an annual scale, several studies highlight the use 210Pb. This work discusses the study of samples taken from different regions of the Santana and Vigario reservoirs. The moisture profiles qualified 4 cores to be analyzed using the 210Pb technique using the CRS model. The metals Cr and Zn showed concentration values above their TEL value, and may be causing some side effect on the fauna and flora of the region. The 210Pb dating showed a significant increase in sedimentation velocities. The increase observed in the Vigario cores was higher than that observed in the Santana core. A slow increase in the sedimentation rate of the Vigario reservoir was observed until the end of the 1990s, while the Santana reservoir showed increases and decreases over the years, suggesting that Santana is more susceptible to annual variations.