South Fork Clackamas River
... that a 70-foot waterfall prevents salmon and other migratory fish from swimming upriver beyond the first 0.4 miles of the South Fork Clackamas River in the U.S. state of Oregon?
... that a 70-foot waterfall prevents <a href="./Salmon" id="mwFlM" rel="mw:WikiLink" title="Salmon">salmon</a> and other migratory fish from swimming upriver beyond the first 0.4 miles of the <b id="mwFlQ"><a href="./South_Fork_Clackamas_River" id="mwFlU" rel="mw:WikiLink" title="South Fork Clackamas River">South Fork Clackamas River</a></b> in the <a href="./U.S._state" id="mwFlY" rel="mw:WikiLink" title="U.S. state">U.S. state</a> of <a href="./Oregon" id="mwFlc" rel="mw:WikiLink" title="Oregon">Oregon</a>?