Huichica Creek Unit Professional Review and Guide
"The Napa-Sonoma Marshes Wildlife Area covers 48,000 acres on the north edge of San Pablo Bay. The marshlands lie between Highway 12 on the north and Highway 37 on the south, straddling Napa, Sonoma, and Solano counties. Within the marsh are saltwater ponds, tidal marshes, seasonally flooded wetlands, agricultural fields, sloughs, and rivers. The rich wetland is fed by the Napa River (which drains Napa Valley) and Sonoma Creek (which drains Sonoma Valley). It is a premier place to observe wildlife and an important habitat for fish, shorebirds, and waterfowl. The tidal marsh was diked for agricultural uses in the late 1800s and early 1900s. In the early 1950s the Leslie Salt Company purchased much of the land and developed it for salt production. Hikes 112–115 access the Napa-Sonoma Marshes from northern and southern points. This hike leads through the north end of the wetlands in the 1,091-acre Huichica Creek Unit. Two paths follow the levees above mudflats, a 300-acre salt pond, water channels, and grasslands."