Authors on the basis of analysis of hydraulic conditions of flow through the road bridge cross-section in the course of road No 363, crossing in Zagrodno Town (Lower Silesia) the Skora riverbed at km 26+150 of its course, present the choice procedure of parameters of this structure cross-section. They pay attention on very disadvantageous location of discussed bridge, without any possibilities to relocation both the road and the bridge. They underline the complex conditions of flood flow within the bridge, as well as they analyze the bridge impact on river flow too. They emphasize the mountain character of the Skora River and significant impact of riverbed development upstream and downstream of the bridge with hydrotechnical and communications structures. Authors pay attention for essential, in this situation, choice of computational river section for the needs of calculations and the choice of the modeling method of flow within studied bridge.

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