In this paper, data of oceanographic parameters (temperature, salinity, oxygen saturation content, nutrient concentrations-orthophosphate and total inorganic nitrogen and chlorophyll a) in the northern Adriatic in 2013 were analyzed and related to the Po River flow rates. Oceanographic data were collected on 7 stations of the profile Rovinj-Po Delta. Data elaboration defined eutrophic conditions in the study area. Furthermore, long-term average statistical models (1972-2004) were used to determine possible significant deviations in values and/or seasonal patterns of all the studied parameters. The ecosystem of the northern Adriatic during spring 2013 was under very intense influence of Po riverine fresh water, therefore, eutrophic conditions consequences, as hypoxia, as well as mucilage events were expected. However, started phenomena are not continued, presumably due to the favourable system of circulation and intensive exchange of the middle and northern Adriatic waters. Significant oligotrofication trend evidenced in the period 2002-2008 due to markedly reduced Po River flow rate was interrupted by re-establishing increased nutrients inflow in the northern Adriatic.