The lower mainstem of Redwood Creek is an important migratory route for anadromous salmonids as it provides access to Lower Subbasin tributaries and upstream spawning areas. The mainstem also may serve as spawning habitat for Chinook salmon during low water years. Elevated water temperature and lack of channel complexity are factors most limiting juvenile anadromous salmonid use of the lower reaches of the mainstem Redwood Creek during the summer months.

Juvenile Chinook, coho, steelhead, and coastal cutthroat have been observed in Lower Subbasin tributaries. These streams provide important salmonid spawning and year round rearing habitat. Water temperature is generally suitable in the tributaries year round. However, tributary streams lack sufficient area in deep, complex pools. Spawning gravels were moderately to highly embedded in fine sediments, which is considered unfavorable for successful incubation salmonid eggs.

The Lower Subbasin offers opportunities for both implementing and effectiveness monitoring of stream and riparian habitat improvement activities. Based on the survey sample sites, appropriate stream habitat improvement activities for Lower subbasin streams include reducing sediment inputs by stabilizing stream bank and hillslope erosion, increasing depth and complexity to existing pool habitats, promoting near stream conifer growth, and adding shelter complexity to cool water refuge sites.