I have an aluminum flat bottom duck boat with a high hp performance surface drive, and run the rivers in the pnw all year long, from bass fishing to salmon to duck season I run mine year round, Rhett make a rock gaurd that bolts to your skeg of the outdrive, it has saved my bacon a couple times. At the end of the day it comes down to knowledge of the river system and reading water
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Gonna need to see some pictures, friend.