West Island is a small island in the San Joaquin River, California. It is part of Sacramento County. Its coordinates are 38°01′24″N 121°46′43″W / 38.02333°N 121.77861°W / 38.02333; -121.77861 (West Island). It is shown, labeled "Webers Island", on an 1850 survey map of the San Francisco Bay area made by Cadwalader Ringgold and an 1854 map of the area by Henry Lange.