Oklahoma State Highway 51

State Highway 51, abbreviated to SH-51 or OK-51, is a major state highway in Oklahoma. It runs for 333 miles (535½ km) east–west across the state, running from the Texas state line to Arkansas. It is the third-longest state highway in the system.

Route description

Texas to I-35

SH-51 begins at the Texas line concurrent with US-60 just east of Higgins, Texas. It remains concurrent for 61 miles (98 km) until it reaches US-270/US-281/SH-3 at Seiling, Oklahoma. At Seiling, SH-51 joins with those three highways for nine miles (14 km) before splitting off on its own.

11 miles (18 km) after splitting off, Highway 51 meets SH-58 in Canton. It then continues east, crossing the North Canadian River and meeting SH-51A before turningnortheast toward Okeene, where it intersects SH-8. SH-51 will go for 24 miles (39 km) before intersecting another highway.In Hennessey SH-51 meets U.S. Highway 81 before continuing eastward. 17 miles (27 km) later, it meets SH-74 north of Crescent. 11 miles (17 km) to the east, it shares a brief concurrency with US-77; two miles (3 km) later it has an interchange at Interstate 35, milemarker 174.

I-35 to Tulsa

After crossing I-35, SH-51 becomes a multilane highway and a major corridor linking I-35 to Stillwater, the home of Oklahoma State University. Along this stretch is an intersection with State Highway 86. When Highway 51...
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