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About Bethel Island, CA

The landform known as Bethel Island was created between 1859 and 1870 by several men, see the names and survey numbers below. (Source: California State Archives for Land Patent Certificate of Purchase for Swamp and Overflow Surveys Numbers 80, 81, 82, 83, 225, 226, 227 and 250). Alonzo Stone purchased much of the property formerly owned by Warren and Anne Bethell, and the area was briefly referred to as the "Stone Tract" in the 1930s. Prior to this, it was referred to as "Sandmound Ranch", "Sandmound Tract" or "Bethel Tract" and contained an estimated area of 6,000 acres (24 km 2), and did not become an island until 1911, when Dutch Slough was dredged eastward to join with Sandmound Slough. East Contra Costa Historical Society has been made aware of these inaccuracies, however has not yet updated their website.