Norris ViaductSubmitted by the City of Cheyenne One dominating feature of Cheyenne is Union Pacific Railroad’s busy Overland Route mainline and its associated rail yard. With a frequency approaching 80 trains per day, it is a significant barrier to transportation within the city. Consequently, the city and Union Pacific have been working together since the 1880s on grade-separated crossings.
The original Norris Viaduct was constructed in 1952 on what was then the east edge of town. For many years, this two-lane steel and concrete structure was part of the main east-west truck route through Cheyenne. With the completion of Interstate 80 in the 1970s, it no longer filled the role of primary truck route; however, it continued to carry more than 13,000 vehicles per day.