During spring migration and winter, Shoalwater Bay supports extremely high numbers of shorebirds, with dominant species being Western Sandpiper and Dunlin. Shoalwater, one of two critically important shorebird sites in Willapa Bay, supports more shorebirds than any other site in southwest Washington. Shorebirds feed on the mudflats, and roost during high tides in the surrounding marshes and pastures. This site also supports large concentrations of waterfowl, especially during fall migration, and relatively large numbers of Dusky and Cackling Canada Geese in winter.
2013 Assessment based on BLM Oregon/Washington Surface Management Ownership dataset (http://www.blm.gov/or/gis/data-details.php?data=ds000011) and Washington Department of Natural Resources Aquatic Land Ownership Parcels (http://fortress.wa.gov/dnr/app1/dataweb/dmmatrix.html).