The California Department of Fish and Game’s Wild Trout Program (now the Heritage and Wild Trout Program, or HWTP) was established by the California Fish and Game Commission (Commission) in 1971 to protect and enhance quality trout fisheries sustained by natural reproduction. The Commission adopted a Wild Trout Policy (Policy) that provides for the designation of "aesthetically pleasing and environmentally productive" streams and lakes to be managed exclusively for wild trout. The Commission directed the Department to study and identify waters that would provide quality wild trout angling for designation as Wild Trout Waters. Wild trout populations in designated waters are to be managed with appropriate regulations to be "largely unaffected by the angling process."
http://www.dfg.ca.gov/fish/Resources/WildTrout/WT_HeritageTProg.asp