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  Tinsley Island Location in the Sacramento–San Joaquin River Delta  Tinsley Island Location in California  Tinsley Island Location in United States | |
| Geography | |
|---|---|
| Location | Northern California |
| Coordinates | 38°02′16″N 121°29′45″W / 38.03778°N 121.49583°W[1] |
| Adjacent to | Sacramento–San Joaquin River Delta |
| Highest elevation | 0 ft (0 m)[1] |
| Administration | |
United States | |
| State | California |
| County | San Joaquin |
Tinsley Island is a small island in the Sacramento–San Joaquin River Delta, in San Joaquin County, California, next to the Stockton Deepwater Shipping Channel. It was created in the 1930s, when dredging to improve the navigability of the San Joaquin River cut it off from Roberts Island. Since 1958, it has been owned by the St. Francis Yacht Club. In 1960, the club transported a lighthouse from San Francisco Bay to serve as its clubhouse, and in the same year began an annual "Stag Cruise"; as of 2024, the club still owns the island and maintains a clubhouse there.