Audubon Lake Wildlife Area Unit (wdfw.wa.gov) The Audubon Lake Unit includes a variety of habitats, including an 80-acre lake, alkaline mudflats, grasslands, and channeled scablands, which attract a variety of birds, and this site offers great opportunities for birdwatchers. This unit is part of the Ice Age Floods National Geologic Trail and the Audubon’s Great Washington State Birding Trail.