| Simmons Island | |
| Image Alt: | Sad-looking aerial photo of an island suffused with muck. |
| Pushpin Map: | United States Sacramento Delta#United States San Francisco Bay Area#USA California#USA |
| Coordinates: | 38.0969°N -121.9906°W |
| Location: | Northern California |
| Waterbody: | Suisun Bay |
| Area Sqft: | or |
| Area Acre: | --> |
| Length Ft: | --> |
| Width Ft: | --> |
| Coastline Ft: | --> |
| Country: | United States |
| Country Admin Divisions Title: | State |
| Country Admin Divisions Title 1: | County |
| Country Admin Divisions 1: | Solano |
Simmons Island is a small island in Grizzly Bay (part of Suisun Bay) in the San Francisco Bay Area of California. It is part of Solano County, and included within Reclamation District 2127. Its coordinates are 38.0969°N -121.9906°W. It is shown as "Simmons Island" on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold, and as "Simons Island" on an 1854 map of the area by Henry Lange. It is labeled, along with Deadman Island, Joice Island, Grizzly Island, Ryer Island and Roe Island, on a 1902 USGS map of the area.