page_title: Interstate 580 (Nevada)
section_title: History
hierarchical_section_title: Interstate 580 (Nevada) / History
caption_attribution_description: English: View from Geiger Grade (Nevada State Route 341) of the construction of Interstate 580 south of Reno, Nevada.
context_page_description: Interstate 580 is a 35.187-mile Interstate Highway in Western Nevada. It runs concurrently with U.S. Route 395 from an intersection with US 50 near the southern boundary of Carson City to the Reno Spaghetti Bowl interchange with I-80 in Reno. The freeway provides a high-speed direct route between Lake Tahoe and Carson City to Reno and I-80.
  Construction on a freeway between Carson City and Reno was planned since 1956, but construction did not occur until 1964. The freeway opened in sections, with the final section opening on August 2, 2017. The I-580 designation was approved on October 27, 1978, but the freeway was not signed as such until the portion between Reno and Carson City was completed following the opening of the Galena Creek Bridge in late August 2012.
context_section_description: Development of the I-580/US 395 freeway has been in planning since 1956, but significant construction did not occur until 1964. The freeway would be opened gradually over time, and would initially be constructed in two main separate sections before 2012.
  The first segment of freeway constructed along I-580 was the Washoe Valley segment, which was constructed between 1964 and 1970 between present-day Bowers Mansion Road/Carson–Reno Highway (exit 50, now exit 16) near Washoe City, south through Washoe Valley to just north of North Carson Street (exit 43, now exit 8) in Carson City.
  The Reno section was constructed between 1973 and 1996. In 1973, the section running between US 395 Bus. (exit 72) to East Second Street/Glendale Avenue (exit 67, now exit 35) in Reno opened to traffic. This section was extended south to Mill Street (exit 66, now exit 34) in 1978, Plumb Lane/Villanova Drive (exit 65, now exit 33) in 1979, South Virginia Street/Kietzke Lane (exit 63, now exit 31) in 1981, Neil Road/Meadowood Mall Way (exit 62, now exit 30) in 1986, South Virginia Street (exit 61, now exit 29) in 1989 and Mount Rose Highway (exit 56, now exit 24) in 1996.
  The Carson City section was constructed in the 2000s with the construction of the Carson City Bypass project. The first phase completed the freeway from North Carson Street (exit 43, now exit 8) south to East William Street (exit 39, now exit 5) in 2006. The freeway was extended south to Fairview Drive (exit 38, now exit 3) in 2009. On August 2, 2017, the final section of the freeway between Fairview Drive (exit 38, now exit 3) and South Carson Street in Carson City opened to traffic.
  In 2012, the section between Mount Rose Highway (exit 56, now exit 24) and Bowers Mansion Road/Carson–Reno Highway (exit 50, now exit 16) south of Reno opened following the opening of the Galena Creek Bridge to traffic in late August 2012, connecting the two main segments together. After the completion of this section, the freeway south of I-80 (US 395 southbound exit 68 and I-580 northbound exit 36) was signed as I-580, officially connecting Carson City to the Interstate Highway System. This left four other state capitals still not served by the Interstate Highway System: Dover, Delaware; Juneau, Alaska; Pierre, South Dakota; and Jefferson City, Missouri.
  The I-580 designation was first approved by the American Association of State Highway and Transportation Officials (AASHTO) on October 27, 1978; at the time, this route extended from I-80 to US 395 (South Virginia Street, at exit 63, now exit 31). AASHTO approved the remainder of planned I-580, to the southern terminus at US 50, US 395 and US 395 Bus. south of Carson City, at its December 7, 1984, meeting. Despite the route number being approved and being shown on some maps in the 1980s, I-580 was not signed along the Interstate until the freeway gap between Mount Rose Highway and Bowers Mansion Road was completed in 2012.
  In October 2019, NDOT began replacing US 395 exit numbers with I-580 exit numbers per federal requirements on the Manual on Uniform Traffic Control Devices.
caption: Old US 395 running through Pleasant Valley, as seen from Geiger Grade (SR 341), with the I-580 extension under construction in the mountains above
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