Tidal marsh near San Pablo Bay

Lower Tubbs Island is a tidal marsh near Midshipman Point in northern San Pablo Bay, California, and is part of the San Pablo Bay National Wildlife Refuge. Historically, Tubbs Island was used as a club for duck hunters, protected by levees that could be opened with the tides to release salt water into the sloughs. In 1969, it was purchased by the Nature Conservancy, and in 1978, it was turned over to the U.S. Fish and Wildlife Service. Once the levees were breached on Lower Tubbs Island, the natural marshes returned.