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Explore the fascinating story of Mormon Island, a once-thriving California Gold Rush town that now lies submerged beneath Folsom Lake. Learn how this important mining settlement grew to rival Sacramento in size and wealth after early gold discoveries along the American River, complete with hotels, saloons, schools, vineyards, and thousands of residents. Discover the factors that led to the town's decline, including crime, fire, and economic challenges, before examining how California's mid-20th century need for flood control and water storage ultimately sealed its fate. Understand the deliberate process of erasing the community as Folsom Dam was constructed, including the demolition of buildings, relocation of the cemetery, and gradual submersion of streets. See how traces of this lost town occasionally reappear during severe droughts, offering glimpses into how quickly thriving communities can vanish when progress reshapes the landscape.