Widdows Island is a small island in the Sacramento–San Joaquin River Delta along the Old River distributary of the San Joaquin River. It is part of San Joaquin County, California. Its coordinates are , and the United States Geological Survey measured its elevation as in 1981. It appears on USGS maps of the area as dry land up to 2018; the latest 2021 topographic map shows the island now mostly flooded, with the old levee surrounding it still above water.
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