State Route 431 (SR 431), commonly known as the Mount Rose Highway, is a 24.413-mile-long (39.289 km) highway in Washoe County, Nevada, that connects Incline Village at Lake Tahoe with Reno. The highway, a Nevada Scenic Byway, takes its name from Mount Rose, which lies just off the highway. Prior to 1976, the highway existed as State Route 27.