During the dumping and dredging operations of East Branch Harbor, Port Said, Eastern Mediterranean, zooplankton community of the surrounding water was studied versus the prevailing environmental conditions between 1999 and 2000. The most affected environmental variable was total suspended solids which showed significant increase at different disposal sampling sites. Other conditions of temperature, salinity, pH, dissolved oxygen content and chlorophyll a were in normal range. The diversity and abundance of zooplankton community were in normal range recorded in the area without significant variation between the dumping and the control sites. In total 68 taxa were recorded in the study area. The density of the total zooplankton standing crop varied between 5021 and 14390 individuals/m3 to 6702 and 16135 individuals/m3, with an average of 8563 and 10071 individuals/m3 at disposal and control sites, respectively. Copepods outnumbered the total zooplankton (average 65.3%) and are dominated by Centropages kroyeri, Paracalanus parvus, Clausocalanus arcuicornis, Oithona nana and Euterpina acutifrons. The results revealed that during the construction of the East Branch Harbor, the dredging and dumping processes may had a very minor effect on zooplankton community but it was not significant.