 The city of Lock Haven is the county seat of Clinton County , in the U.S. state of Pennsylvania . Located near the confluence of the West Branch Susquehanna River and Bald Eagle Creek , it is the principal city of the Lock Haven <unk> Statistical Area , itself part of the Williamsport – Lock Haven combined statistical area . At the 2010 census , Lock Haven 's population was 9 @,@ 772 . 
