Is the survival rate of hand carried Chinook broodstock comparable to the survival rate of Whooshh transported Chinook broodstock at Roza dam on the Yakima River?

Yes, in fact in this 2014 study the survival rate of Whooshh transported Chinook broodstock was better than that of the hand carried Chinook broodstock.  Although the total number of fish transferred was small, the Whooshh fish mortality rate was approximately one-half that of the hand carry transport method.