Ten Mile River
... that the number of coho salmon spawning on the Ten Mile River in Mendocino County, California, has dropped precipitously since the 1960s?
... that the number of <a href="./Coho_salmon" id="mwAbU" rel="mw:WikiLink" title="Coho salmon">coho salmon</a> <a href="./Spawn_(biology)" id="mwAbY" rel="mw:WikiLink" title="Spawn (biology)">spawning</a> on the <b id="mwAbc"><a href="./Ten_Mile_River_(California)" id="mwAbg" rel="mw:WikiLink" title="Ten Mile River (California)">Ten Mile River</a></b> in <a href="./Mendocino_County,_California" id="mwAbk" rel="mw:WikiLink" title="Mendocino County, California">Mendocino County, California</a>, has dropped precipitously since the 1960s?