Lifecycle management of coastal dikes is required for making their life span as longer as possible. The purpose of this study is to investigate cracks, unevenness and compressive strength of concrete armored coastal dikes constructed more than 40 years ago along Mikawa Bay, by means of field measurement with 30m tape, 30cm steel rule with mm scale, level and Shumitt hammer. The field measurement shows that crackings are classified into seven patterns, and that the probability of crack occurrence on the concrete armored crown is about 0.4, which is higher than those of the seaward and landside slopes of the coastal dikes. The averaged crack-propagating speed per year after construction is found out to be less than 0.32cm/y on the armored crown and less than 0.17cm/y on the armored seaward and landward slopes.

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