County Route 10 (CR 10), locally known as the Oatman Highway or the Oatman–Topock Highway, is a 50.1-mile-long (80.6 km) northeast–southwest highway in Mohave County, Arizona, United States. The highway is primarily used to serve the cities of Oatman and Topock. The road is almost entirely concurrent with Historic Route 66. The 8-mile-long (13 km) stretch through the Black Mountains, also known as "The Sidewinder", has 191 curves, turns, and switchbacks.