arch-gravity dam
...that the Hoover Dam is an arch-gravity dam, combining the load-bearing features of a gravity dam and an arch dam?
...that the <a href="./Hoover_Dam" id="mwFuo" rel="mw:WikiLink" title="Hoover Dam">Hoover Dam</a> is an <b id="mwFus"><a href="./Arch-gravity_dam" id="mwFuw" rel="mw:WikiLink" title="Arch-gravity dam">arch-gravity dam</a></b>, combining the <a class="mw-redirect" href="./Load-bearing" id="mwFu0" rel="mw:WikiLink" title="Load-bearing">load-bearing</a> features of a <a href="./Gravity_dam" id="mwFu4" rel="mw:WikiLink" title="Gravity dam">gravity dam</a> and an <a href="./Arch_dam" id="mwFu8" rel="mw:WikiLink" title="Arch dam">arch dam</a>?