The article presents the analysis of influence of river bed shading by the trees and bushes on flow conditions on the selected section of the Wełna River. The research area were selected as the lying mutually adjacently sections of the river (one in a small grove, and the second in the open field without of trees and shrubs). The flow rate and velocity distributions were determined in the cross sections based on of field measurements. Additionally, there were measured the decrease in water tableand grain size curves developed. The LAI index were measuredin the grove and the number and macrophytesspecies composition was described in the investigated cross sections. Based on the results, the impact of river bed shading by plant community were determined due to the shaping the geometry and flow resistance in the riverbed.