dardenelle lock & dam is # 10 russellville,ar / ozark-jeta taylor lock & dam is #12 ozark,ar / james w. trimble lock & dam is # 13 barling,ar the arkansas river does not have a lock & dam # 11. do not know why! unless they plan on building a lock & dam # 11 in between russellville and ozark, later down the road. (highly doubtful)