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Source: https://erdc-library.erdc.dren.mil/jspui/ ; By means of a questionnaire and literature review, a survey of existing Corps structures using concrete armor units was conducted. Nine structures were found to exist that use either one or a combination of the following concrete armor units: dolosse, tetrapods, tribars, and quadripods. Both reinforced and unreinforced units have been used; and based on the data compiled in this survey, no statement can be made as to the advantage or disadvantage of using steel reinforcement in concrete armor units. Both construction breakage and storm breakage have been cited as the major causes of existing concrete armor unit breakage. Of the nine structures surveyed, none were reported to be in danger of failing due to the existing breakage; but several structures are being closely observed to see what effect, if any, the existing or additional armor unit breakage will have on the overall stability of the structures.