Lewiston Hill, Summit and escarpment in Nez Perce County, Idaho, US.

Lewiston Hill is a sloping escarpment immediately north of where the Clearwater and Snake rivers meet in north central Idaho. Its face drops 2,015 feet (614 m) from the 2,756-foot (840 m) rim to the water of Lower Granite Lake, and white letters L and C are painted on the slope below the summit.

The site posed transportation challenges for travelers until an innovative spiral road was constructed in 1917. After serving as the main route for decades, a new and straighter alignment was built in 1977.

The white letters L and C painted on the slope below the summit stand for Lewiston and Clarkston, the two cities at the foot of the hill. The Old Spiral Highway, opened in 1917, has 64 curves and was praised as one of the best-engineered mountain roads of its time. Charlie Ryan said the 1950s hit "Hot Rod Lincoln" was inspired by a race up this hill.

U.S. Route 95 passes over the summit, with a rest area at the junction with Route 195 offering good views of the area. The site is easily accessible from the main highway.

Charlie Ryan's 1950s rock and roll hit "Hot Rod Lincoln" recounts a race on Lewiston Hill; later versions moved the setting to San Pedro or The Grapevine, but Ryan said at performances that the hill inspired him. In 1990 the fifth stage of the Ore-Ida Women's Challenge cycling race finished with a climb up the Old Spiral Highway.