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The paper contains analysis of ice phenomena occurrence in the light of recent observations conducted on middle Odra river from Krapkowice (ca. km 125+000) to Krosno Odrzańskie (ca. km 530+000). In detail the research embraced time of occurrence and intensity of individual ice phenomena in years 2006–2017 together with reference and comparison of data to previous data from period 1957–2005. In characteristic cross-sections there is a reference to occurrence of all observed forms of ice phenomena (frazil ice, border ice, ice cover, floe and ice-jam). In the study a reference data of Regional Water Management Authority in Wrocław were used together with results of previous research conducted at the Wrocław University of Environmental and Life Sciences. The results legitimized, that the occurrence of ice phenomena on middle Odra river has time of its appearance, duration and intensity and is not stable in every year. Occurrence of ice phenomena on middle Odra river varies in time, being observed as manifold forms of icing – most frequently border ice and frazil ice. During the last 12 years greater than the average number of days with ice phenomena occurrence can be observed, but these phenomena have definitely “milder” character (border ice).

Analysis of ice phenomena hazard on the middle Odra river