State Highway 128 (SH-128) is a 2.2-mile-long (3.5 km) state highway in the U.S. state of Idaho, serving the city of Lewiston in Nez Perce County. The highway travels east along the Clearwater River within Lewiston from Washington State Route 128 (SR 128) to U.S. Route 12 (US 12). It was created in 1989 after improvements were made to an existing county road.