Old Spiral Highway is one of the best motorcycle roads in Idaho, USA. The very twisty road (64 curves) is short, is curvy, is smooth, and is most definitely sweet. Don’t stuff your belly too much.
The Old Spiral Highway, aka "The Old Lewiston Grade" is only 11.74km (7.3 miles) long. Constructed in 1917, the Spiral Highway took 64 turns to traverses 2000 feet of elevation change. The drive is definitely worth it. It was considered a huge feat in engineering at the time and a breakthrough in early highway construction. This short and technical motorcycle route is certainly one of the best rides in the area.
The road is paved. It’s a difficult road, with uncountable turns and twists. This old 2-lane of alignment of US Route 95 heads up the breathtaking 2000 foot tall grade in a very short 8 miles. The road is loaded with twists and turns and dramatic switchbacks. It is also freshly repaved - too good to be true. The road was the subject of the 1950s rock n' roll song called "Hot Rod Lincoln".
The road runs south-north from ID-128 road at 272m above the sea level, towards US-95 road, at 822m above the sea level. The road is 11.74km long. Over this distance the elevation gain is 550 meters. The average gradient is 4.68%.