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This report summarizes results of field investigation conducted during September to November, 2005, to show some characteristics of the mechanical or structural damages of irrigation ponds which were caused by the Mid Niigata Prefecture Earthquake in 2004. Nagaoka and Ojiya, Niigata, were selected for the field investigation because these areas suffered most serious losses. Section, height and direction of embankment of the irrigation pond were surveyed, dry bulk density of surface soil of the embankment was measured by using RI counter, and some diagnoses of the mechanical or structural damage of the embankment were recorded based on simple observation. The distance of the embankment from seismic center of the first eruption of earthquake was determined from isoseismic map published by the Japan Meteorological Agency. Particle density and size of soil sampled from the embankment during the field investigation were measured in the laboratory. The degree of mechanical or structural damage was classified into level 0 to 3 by 1 based on the simple diagnoses recorded in the field investigation. Level 0 means no damage and 3 the most serious state of damage at which the embankment of irrigation pond never works. The degree of mechanical or structural damage was related to the distance from seismic center taking the embankment height into account. Any acceptable relationship between the degree of mechanical or structural damage and the distance from seismic center is not found. The dry bulk density of soil measured at no-damaged embankment was compared with that of the seriously damaged embankment to obtain some possible understand that a recognition of soil compaction during construction of the embankment may be an important key which determines the degree of mechanical or structural damage, or inversely, a resistance of the embankment against big earthquake. 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