Silver Creek
... that Silver Creek flows through a canyon near Riley, Oregon, with over 200-foot (60 m) tall walls?
... that <b id="mwCdk"><a href="./Silver_Creek_(Harney_County,_Oregon)" id="mwCdo" rel="mw:WikiLink" title="Silver Creek (Harney County, Oregon)">Silver Creek</a></b> flows through a canyon near <a href="./Riley,_Oregon" id="mwCds" rel="mw:WikiLink" title="Riley, Oregon">Riley, Oregon</a>, with over <span about="#mwt54" data-mw='{"parts":[{"template":{"target":{"wt":"convert","href":"./Template:Convert"},"params":{"1":{"wt":"200"},"2":{"wt":"ft"},"3":{"wt":"m"},"4":{"wt":"-1"},"adj":{"wt":"on"}},"i":0}}]}' id="mwCdw" typeof="mw:Transclusion">200-foot (60</span><span about="#mwt54" typeof="mw:Entity"> </span><span about="#mwt54">m)</span> tall walls?