Trout Creek Hill
... that the Trout Creek Hill volcanic eruption approximately 340,000 years ago, during the Pleistocene, produced a lava flow that extended 20 km (12 mi), temporarily damming the Columbia River?
... that the <b id="mwAuU"><a href="./Trout_Creek_Hill" id="mwAuY" rel="mw:WikiLink" title="Trout Creek Hill">Trout Creek Hill</a></b> volcanic eruption approximately 340,000 years ago, during the <a href="./Pleistocene" id="mwAuc" rel="mw:WikiLink" title="Pleistocene">Pleistocene</a>, produced a lava flow that extended <span about="#mwt42" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"20"},"2":{"wt":"km"},"3":{"wt":"mi"},"4":{"wt":"0"},"abbr":{"wt":"on"}},"i":0}}]}' id="mwAug" typeof="mw:Transclusion">20</span><span about="#mwt42" typeof="mw:Entity"> </span><span about="#mwt42">km (12</span><span about="#mwt42" typeof="mw:Entity"> </span><span about="#mwt42">mi)</span>, temporarily damming the <a href="./Columbia_River" id="mwAuk" rel="mw:WikiLink" title="Columbia River">Columbia River</a>?