Interstate 80 (I-80) traverses the northern portion of the US state of Nevada. The freeway serves the Reno metropolitan area and passes through the towns of Fernley, Lovelock, Winnemucca, Battle Mountain, Carlin, Elko, Wells, and West Wendover on its way through the state. I-80 follows the historical routes of the California Trail, first transcontinental railroad and Feather River Route throughout portions of Nevada. Throughout the entire state, I-80 follows the historical routes of the Victory Highway, State Route 1 (SR 1), and US Route 40 (US 40). The freeway corridor follows the paths of the Truckee and Humboldt rivers. These rivers have been used as a transportation corridor since the California Gold Rush of the 1840s. The Nevada portion of I-80 has been designated as the Dwight D. Eisenhower Highway and Purple Heart Trail. Route description Truckee River I-80 enters Nevada in the canyon of the Truckee River, paralleling the California Trail and first transcontinental railroad. Upon exiting the canyon, the freeway serves the Truckee Meadows, a name for the urban area consisting of Verdi, Reno, and Sparks. The freeway passes north of downtown Reno in a depressed alignment before intersecting I-580/US 395. The interchange with US 395 is the busiest portion, averaging 122,000 vehicles per day in 2006. The freeway passes through downtown Sparks via a viaduct over the casino floor of the Nugget Casino Resort. After leaving the Reno metropolitan area, the freeway resumes following the Truckee River in a canyon to Fernley and passes the Northern Nevada Veterans Cemetery to the north. Traffic volumes drop to 26,600 vehicles per day by Fernley and continue dropping to 8,400 by the time the freeway reaches the center of the state. The freeway exits the Truckee River corridor near Wadsworth. Lahontan Valley/Forty Mile Desert Past Wadsworth, the freeway cuts across the Lahontan Valley. The Lahontan Valley is a barren desert, sometimes called the Forty Mile Desert, from the era of the California Trail. The name comes from the California Gold Rush where the emigrants who came into the Lahontan Valley via the Humboldt River. The travelers would have then to endure without usable water while crossing the valley, regardless of which of the two routes across the valley the travelers followed. I-80 closely approximates the path of the emigrants between the Humboldt and Truckee rivers. A marker stands at a rest area on the eastern edge of the valley, near