Tsukabaru Dam
... that, when it was built, the 87-metre (285 ft) high Tsukabaru Dam was the tallest gravity type dam in Japan?
... that, when it was built, the <span about="#mwt65" data-mw='{"parts":[{"template":{"target":{"wt":"Convert","href":"./Template:Convert"},"params":{"1":{"wt":"87"},"2":{"wt":"m"},"adj":{"wt":"on"}},"i":0}}]}' id="mwDi4" typeof="mw:Transclusion">87-metre (285</span><span about="#mwt65" typeof="mw:Entity"> </span><span about="#mwt65">ft)</span> high <b id="mwDi8"><a href="./Tsukabaru_Dam" id="mwDjA" rel="mw:WikiLink" title="Tsukabaru Dam">Tsukabaru Dam</a></b> was the tallest gravity type dam in Japan?