My daughter checked out a book on salmon from her library, and of course the topic turned to dams and fish ladders. It got me thinking about dams without passage and if there is also the possibility of residualized salmon "seeding" a resurgence after a dam removal a la steelhead on the Elwha? In OR and WA I have caught micro-jack (8-12") sized chinook and coho, some still with parr marks. All of those rivers still have an ocean going spawning component though. Can residualized salmon smolts spawn with other residualized smolts? Or do they still need the bigger ocean returners to keep a population?