Utah's History By NYbrooklyn Jul 24, 1847 Brigham Young leads wagon train into utah Sep 9, 1850 Utah becomes a territory May 10, 1869 Transcontinental Railroad is finished Mar 1, 1879 First Telephone service established in Utah Mar 23, 1882 Edmunds act passed by congress Sep 23, 1890 Wilford Woodruff isuses Manifesto Aug 14, 1909 Rainbow Bridge Discovered Jun 17, 1914 Trancontinental Telephone line Finished Sep 15, 1928 Bryce Cayon National Park established Sep 3, 1932 The Great Depression Jun 30, 1943 Geneva Steel plant begins operating in Utah Jan 1, 1950 Nuclear Weapons tested in Utah desert Sep 27, 1964 Flaming Gorge Dam Dedicated Jan 18, 1970 Mormon Prophet David Mckay dies May 26, 1984 State Street Becomes a River cause of record snowfall Feb 8, 1995 Site for the winter olympics announced Jan 1, 2002 Winter Olympics held in Utah Apr 1, 2010 New Dinosaur skeleton found