abutment anchorage anchorage ground arc-boutant arch dam backstop bamboo curtain bank bar barrage barrier basin beam bear-trap dam beaver dam berth boom breakwater breastwork brick wall buffer bulkhead bulwark buttress buttress pier buttressing cofferdam dam defense dike ditch dock dockage dockyard dry dock earthwork embankment fence flying buttress gate gravity dam groin hanging buttress harbor harborage haven hydraulic-fill dam iron curtain jam jetty jutty landing landing place landing stage leaping weir levee logjam marina milldam moat mole moorings mound parapet pier pier buttress port portcullis protected anchorage quay rampart retaining wall road roadblock roads roadstead rock-fill dam seaport shipyard shoulder shutter dam slip stone wall wall weir wharf wicket dam work