The DFG has released its EIR on hatchery supplements (planted fish). You can view it at http://www.dfg.ca.gov/news/pubnotice/hatchery/ Be forewarned that its several hundred pages of text, maps, tables. Chapter 4 and appendix K are good starting point. My quick distillation is that for PC, the potential of salmon and steelhead runs in the lower creek is keeping the Creek off the plant list, as well as the potential of the wild fish being native fish.
Hopefully the new game going forward, not just for Putah but for any system with potential for a sustainable wild fishery, is to let the fish take care of the reproduction. They are much more cost effective than a hatchery. We need to take care of the hard part which is flow management, habitat protection/restoration, managing water quality, and fishery regulation and enforcement.
Put and take management has been a losing proposition, a mid 20th century misguided and unintended experiment that ultimately failed as a broad based fishery management strategy, a practice that has masked the damage that's been done to our waterways through various acts of man, and one that has irreparably harmed the genetic diversity that has provided the resiliency of these fish over hundreds of thousands of years.