The river exits the wildlife refuge, and about from the mouth, the stream curves to the northwest and enters Ridgefield, which is on the right. A mile or so later, Bachelor Island Slough enters from the left, and Carty Lake is on the right as the stream re-enters the wildlife refuge. Lake River enters the Columbia River at the north tip of Bachelor Island, about upstream of the mouth of the Lewis River and about from the Columbia's mouth on the Pacific Ocean.