Sensitive aquatic species with ranges that overlap the four study watersheds: Upper Redwood Creek (URC), Redwood Creek South (RCS), Salmon Creek (SC), and Outlet Creek (OC).

1The California Department of Fish and Wildlife designates certain vertebrate species as Species of Special Concern (SSC) because declining population levels, limited ranges, and/or continuing threats have made them vulnerable to extinction. Though not listed pursuant to the Federal Endangered Species Act or the California Endangered Species Act, the goal of designating taxa as SSC is to halt or reverse these species’ decline by calling attention to their plight and addressing the issues of conservation concern early enough to secure their long-term viability.2 The California Natural Diversity Database (CNDDB) designates conservation status rank based on a one to five scale, one being “Critically Imperiled”, five being “Secure”. Uncertainty about a rank is expressed by a range of values, thus a status of S1S2 indicates that there is uncertainty about whether Margaritifera falcata ranks as state “Critically Imperiled” (S1) or state “Imperiled” (S2) [41].Sensitive aquatic species with ranges that overlap the four study watersheds: Upper Redwood Creek (URC), Redwood Creek South (RCS), Salmon Creek (SC), and Outlet Creek (OC).