The paper discusses the use of geoinformation systems during the impact study on the environmental components of the Sayano-Shushensky reservoir within Tuva. Object under study is lake-like expansion or Shagonar pool the feature of is periodic existence as a reservoir. The results of field observations and study of library materials inspired the creation of a geoinformation system. Integration issues and data structuring are resolved, created a series of interconnected maps solving the problem of visualization and cartographic modeling of natural and anthropogenic impacts due to GIS. Geoinformation database of indicators of ecological condition of Shagonar pool aquatic and terrestrial ecosystems are created. The cartographic analysis features of hydrochemical and bacteriological conditions and factors of water pollution, pollution nature and sources of reservoir benthal deposits with heavy metals are analyzed, modern exogenous-geological processes are indicated and mapped. Zoning of Shagonar pool area is carried out for the first time by conditions and extent of anthropogenic influence based on the spatial analysis of the multi-componental impact specificity of reservoir operation.