Washington State Route 504
... that seven of eight major bridges on Washington State Route 504 were destroyed by a lahar during the 1980 eruption of Mount St. Helens?
... that seven of eight major bridges on <b id="mwB_8"><a href="./Washington_State_Route_504" id="mwCAA" rel="mw:WikiLink" title="Washington State Route 504">Washington State Route 504</a></b> were destroyed by a <a href="./Lahar" id="mwCAE" rel="mw:WikiLink" title="Lahar">lahar</a> during the <a href="./1980_eruption_of_Mount_St._Helens" id="mwCAI" rel="mw:WikiLink" title="1980 eruption of Mount St. Helens">1980 eruption of Mount St. Helens</a>?