This wildlife area is comprised of several units totaling approximately 4,200 acres of tidal salt marsh, mudflats, coastal oak woodlands, and coastal scrub habitats. It is comprised of several units including: Petaluma River, Burdell, Bahia, Black John, Day Island, Green Point, Novato Creek, Point Sonoma, and Rush Creek. The Petaluma River Unit is the largest remaining natural tidal brackish marsh in California, supporting primarily pickleweed, cordgrass, alkali bulrush, and saltgrass.
The upland habitat in the area supports deer, raccoons, jackrabbits, and foxes, among others. Migratory bird species use the area most heavily during the fall and winter months, but many can be found year round. Wetland bird species include willits, curlews, dowitchers, night herons, and black-bellied plovers. For more information, call the Bay Delta Region Napa office at (707) 944-5500.