Simms Island

Simms Island is a former marsh island in San Francisco Bay. It is in Marin County, California; Its coordinates are 37.95917°N, -122.505°W, and the United States Geological Survey (USGS) gave its elevation as 13 ft in 1981. It appears as an island on a USGS map in 1897; it is labeled in a 1954 map, but fully connected to the mainland.