Clatskanie is the interchange where loaded log cars and empties for the branch to Victoria are exchanged.
Besides the Victoria Interchange, Clatskanie has a processing plant for canned milk and a millworks.
At the west end of Clatskanie trains going left climb the grade to Victoria. Trains heading right on the lower track continue west on the mainline towards Astoria.
West of Clatskanie the mainline crosses Fish Hawk Creek before disappearing into a tunnel. .