Saint Croix Island International Historic Site is best reached by private vehicle. The site is located 8 miles (13 km) south of Calais, Maine, on US Route 1, and can be reached either by Route 9 from Bangor or US Route 1, the coastal route from Portland and points south. From US Route 1, turn onto St. Croix Drive. The entrance gate is on the right. The visitor center is inside the ranger station.