Marmes Rockshelter
...that despite being a National Historic Landmark and the site of Washington's oldest known human remains, the Marmes Rockshelter was submerged after the Lower Monumental Dam construction?
...that despite being a <a href="./National_Historic_Landmark" id="mwFPo" rel="mw:WikiLink" title="National Historic Landmark">National Historic Landmark</a> and the site of <a class="mw-disambig" href="./Washington" id="mwFPs" rel="mw:WikiLink" title="Washington">Washington</a>'s oldest known human remains, the <b id="mwFPw"><a href="./Marmes_Rockshelter" id="mwFP0" rel="mw:WikiLink" title="Marmes Rockshelter">Marmes Rockshelter</a></b> was submerged after the <a class="mw-redirect" href="./Lower_Monumental_Lock_and_Dam" id="mwFP4" rel="mw:WikiLink" title="Lower Monumental Lock and Dam">Lower Monumental Dam</a> construction?