While the greater Green Valley watershed in the lower Russian River has been central to recovery efforts for endangered coho salmon, its largest subwatershed, the Atascadero, comprising fully 60% of Green Valley’s blue-line streams, remains uninhabited by coho for reasons that have never been identified, despite the presence of high-quality rearing reaches in its upper tributaries. The Gold Ridge RCD and its partners are conducting a comprehensive subwatershed-wide assessment of the Atascadero to identify potential limiting factors to coho passage and survival, and to identify and prioritize site-specific projects to address them.