Completed the investigation of parameters of non-uniform motion in the central part of the tailrace of the Irkutsk hydroelectric station based on topographic maps and river channel surveys Angara river for a length of 24 km. Determined a change in depth, width, current velocity, water surface slope, hydraulic roughness, depending on the influence of hydraulic structures, thermal pollution flow, mining and dredging. The reviewed plot is different with many arms and a high level of anthropogenic impact.