Route 108 begins at an intersection with Ocean Road in the village of Narragansett Pier, several blocks north of Point Judith Light. Route 108 proceeds eastward as Point Judith Road, before turning northward at White Swan Road. The route is residential in nature for several blocks, soon intersecting with the Galilee Escape Route, which connects Route 108 to the village of Galilee and the Point Judith Block Island Ferry, which connects to Block Island. Route 108 continues north through Naragansett Pier, passing west of the park that once served as Fort Nathanael Greene. After the junction with Knowlesway Extension, Route 108 becomes residential once again, winding northward through the northern end of the village. After Burnside Avenue, the route winds northward, passing west of the Port Judith Country Club as a two-lane residential and wooded road.