Back in the 90s, I think, WDFW tried to measure the success of Green River Chinokk spawning in the the wild. In the Deschutes. Put up a goodly number of hatchery clipped adults. Got back non-clipped adults. But, the number that came back could be either survivors of the spawning or survivors of the "drops"; those hatchery fish that were not marked.

At the same time, we know that hatcheries have restored wild populations; the White River Springers come to mind.

I do remember way back that some of us bios were wondering if the native PS Chinook were a few Springs and primarily Summers. There is a nagging memory that the Green River stock actually originated in the Green tributary to the Toutle. Records are poor, but those transfers were made, too.