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We wanted to know what effect Käsmu harbour has on water characteristics. According to those questions we picked three places: Käsmu pier, Käsmu harbour and Käsmu stone beach. We measured all those places in one day. The whole expedition was about five hours long. The Käsmu pier and the stone beach have been untouched; only the Käsmu harbour had been dredged about two weeks ago and also new floating water bridges were added there. Our hypothesis was: Harbour area water characteristics are affected by the harbour. Our main goal is to investigate if the harbour has an effect on water characteristics. The characteristics of water that we measured and GLOBE protocols used were air temperature, transparency with transparency tube, water temperature, dissolved oxygen level, conductivity, pH, alkalinity, nitrates. We proved that our hypothesis was right and that water in the harbour has slightly different characteristics. If the project continues in the future, we would like to measure for a longer time and during other seasons. And also to study the difference in the harbour with hindsight from its dredging. In the future, it would be nice to go back, take the same measurements and see if the results change. We would also like to know how the results change seasonally or even at nighttime. This way we would have a more exact picture of the effect Käsmu harbour has on water characteristics. Key words: hydrology, water characteristics, Käsmu harbour