In 1956, the Southern Pacific Railroad built an earthen causeway to replace the Lucin Cutoff. Construction of the causeway required one of the largest earth-moving projects in history. Learn how a design flaw led to water circulation issues that left the northern arm of the lake 20-25 percent saltier than the southern arm. An excerpt from the 22-part video series THE GEOGRAPHY OF UTAH, conceived and written by Albert L. Fisher, PhD (University of Utah). The series encompasses the political, cultural, historical and sociological geography of the state of Utah.