Interstate 580 begins at U.S. 50 (Carson Street) in Carson City and extends north 35.076 miles to meet Interstate 80 in Reno. The route overlaps with U.S. 395 along the Carson City Bypass, the Washoe Lake Freeway, the Interstate 580 Freeway Extension over Galena Creek, and the Martin Luther King Jr. Memorial (North-South) Freeway in Reno. Until early October 2012, the Interstate-standard segments of Interstate 580 were signed solely as U.S. 395, with I-580 unmarked. U.S. 50 also joins I-580 for the initial five miles of the Carson City Bypass, departing east at Williams Street (Exit 5) to Fallon.
The Carson City Bypass portion of I-580 opened in segments, with the southernmost 3.146 mile section opening to traffic on August 2, 2017. Beginning in Summer 2019, NDOT started changing exit numbers along the entire stretch of freeway between Carson City and Reno to reflect I-580 mileage. Exit numbers previously referenced U.S. 395 mileage, beginning at Exit 38 (Fairview Drive) and ending at Exit 68A/B (I-80). The new exit numbers begin at Exit 3 and conclude at Exit 36A/B. Completion of the changes took place by late 2019.
Interstate 580 Nevada Guides
Plans for the North-South Freeway (U.S. 395) in Washoe County developed in 1957 and studies were underway for the route from Winters Ranch to Glendale Avenue by 1963. A recommended freeway alignment for this segment was selected in 1968.1
Further south at Lakeview and the Carson City / Washoe County line, work was underway to upgrade U.S. 395 to four lanes by 1964. Construction progressed through 1970, when the segment from Eastlake Boulevard (Exit 44) at Lakeview north to Winters Ranch (near Exit 50) opened.1
Unsigned Interstate 580
Interstate 580 was originally unmarked along the North-South Freeway through Reno, and signed instead as U.S. 395. The designation appeared on the 1982 Reno map published by the California State Automobile Association (CSAA). The map displayed I-580 along the U.S. 395 freeway between South Virginia Street and Interstate 80. Other maps showed Interstate 580 as a marked route for three or four years, including the 1985 Rand McNally map of Reno.
Some signs for I-580 were posted in the field, including on approaches to U.S. 395 from intersecting roadways and on freeway entrance assemblies. Robert Herron further wrote on September 16, 2002 that guide signs displaying I-580 shields were greened out by the late 1980s, and that the rationale per a TV news story at the time was to reduce motorist confusion, since I-580 only ran south with U.S. 395 from Interstate 80.
Ed Wilson, retired Nevada DOT Customer Services Representative, added that the "general public remains more comfortable with the '395' moniker. Actually the proper designation seems to be important only to the FHWA, NDOT, land use planners, a few highway buffs, and such. Mr. and Mrs. America seem to just get confused with all the different letters and numbers, so we try to keep life simple for them."
- Project History and Overview,
http://www.freewayextension.comI-580 Extension Project web site.
- "New I-580 Freeway Opening Date Announced." KOLO-TV Reno, August 14, 2012.
- "Gov. Brian Sandoval: I-580: The history -- and the promise by Governor Brian Sandoval." FOX-Reno News, August 14, 2012.
- "New I-580's name explained." NEWS 4 Reno KRNV-TV, August 7, 2012.
- "I-580 Or US 395?" KOLO-TV Reno, August 16, 2012.
- Nevada Department of Transportation : I-580 / U.S. 395, NDOT project web site.
Page Updated 07-05-2018.