Hidden History Beneath Folsom Lake – Mormon Island to Salmon Falls is the fifth of a five part series that recorded many historical gold rush sites revealed when Folsom Lake hit record low water levels during the drought of 2015. On numerous hikes across the drought parched Folsom Lake bed, Kevin Knauss took numerous photos of historical sites and structures that were usually covered by water. Knauss researched the various sites and structures, some dating back to the 1850s, and marked the spots on various maps included in the book. He also includes newspaper accounts and recollections of the life and landscape as it was witnessed before Folsom Dam was built at the confluence of the North and South forks of the American River.The Mormon Island to Salmon Falls book includes many maps and photos showing the remnants of mining operations, Mormon Island cemetery and school, Red Bank dairy, Negro Hill and Natomas water ditches rock retaining walls, and the old Salmon Falls Bridge when Folsom Lake reached during the 2015 drought. This book traces the history along the South Fork of the American River.