Reference

Because the former site is under Folsom Lake, ... St. Thomas, Nevada, another former Mormon community submerged by a man-made lake; Mormon Island (Colorado River), an island in the Colorado River below the mouth of the Virgin River. ... Mormon Island History from myfolsom.com; Pictures of Mormon Island during a drought, Raise The Stakes Editions

Mormon Island, a Gold Rush-era town now submerged under Folsom Lake, occasionally becomes visible during droughts, revealing historical artifacts. We've got several ghost towns in Northern California, but not very many that are underwater! In the 1850s, Mormon Island was one of the largest towns involved in the Gold Rush. The town was founded ...

History of Mormon Island and Salmon Falls. Mormon Island, Salmon Falls, and numerous small mining camp sites and flats were submerged underwater when Folsom Dam created Folsom Lake in 1955. At low water the remains of these towns can sometimes be seen, though very rarely. Visible remnants of numerous foundations and artifacts include a dairy, a ...