High Quality Content by WIKIPEDIA articles! State Highway 15 (abbreviated SH-15 or OK-15) is the name for two once-connected state highways in Oklahoma. One begins at the Texas state line and runs for 47.1 miles (75.8 km) through Woodward; the other runs for 62.4 miles (100.4 km) between U.S. Highway 64/U.S. Highway 412 and State Highway 18 north of Pawnee. SH-15 has no lettered spur routes.