title: Simms Island
text: # Simms Island
  
  Simms Island is a former marsh island in San Francisco Bay. It is in Marin County, California; Its coordinates are 37°57′33″N 122°30′18″W﻿ / ﻿37.95917°N 122.50500°W﻿ / 37.95917; -122.50500﻿ (Simms Island), and the United States Geological Survey (USGS) gave its elevation as 13 ft (4.0 m) 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.
  
  * USGS survey map from 1897.
  * USGS survey map from 1954.
  * USGS aerial imagery from 2021.
  