Over a 14 year period in five major tributaries of the upper Willamette River some 1 percent and up to 100 percent of returning wild adult female spring chinook salmon died before they could spawn, according to a recent study.
Over a 14 year period in five major tributaries of the upper Willamette River some 1 percent and up to 100 percent of returning wild adult female spring chinook salmon died before they could spawn, according to a recent study.