Оклахома штатының 51 тас жолы

State highway in Oklahoma, United States

State Highway 51, abbreviated to SH 51 or OK 51, is a major state highway in Oklahoma, United States. It runs for 332.8 mile (536 km) east–west across the state, running from the Texas state line to Arkansas. It is the third longest state highway in the system.

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 mile (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 turning
northeast toward Okeene, where it intersects SH 8. SH 51 will go for 24 mile (39 km) before intersecting another highway. In Hennessey SH 51 meets US 81 before continuing eastward. 17 mile (27 km) later, it meets SH 74 north of Crescent. 11 mile (18 km) to the east, it shares a brief concurrency with US 77; 2 mile (3 km) later it has an interchange at Interstate 35 at Exit 174.

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 13 mile (21 km) stretch is an intersection with SH 86. When SH 51 reaches Stillwater, it meets US 177. Continuing east from Stillwater, the road returns to a two lane highway after sharing a 1 mile (2 km) concurrency with SH 108 and intersects with SH 18 8 mile (13 km) later. 4 mile (6 km) east of this, it passes through Yale, Oklahoma before crossing SH 99. It becomes a multilane highway again after SH 48. It turns into the "Mannford Freeway" before passing through the small towns of Mannford and Lotsee on its way toward the Tulsa area.

In Sand Springs, SH 51 crosses the Arkansas River with SH 97 before merging onto the Sand Springs Expressway (US 412/US 64). When this
freeway ends at I 244 near downtown Tulsa, SH 51 merges onto I 244 southbound only to exit 1 mile (2 km) later, where it runs concurrent with US 64/US 75. This freeway is actually Interstate 444, but the route is not signed as such. After one more mile, SH 51 leaves the interstate with US 64 and becomes the Broken Arrow Expressway, a freeway running northwest–southeast through Tulsa which is known as "The BA" by locals and local media. US 64 leaves the freeway as a concurrency with US 169 southbound. Later, SH 51 will exit the freeway and become a four lane highway toward Coweta. The mainline freeway becomes the Muskogee Turnpike. At Coweta, SH 51 turns back east after heading southeast through the Tulsa area. After crossing the Muskogee Turnpike again and bridging the Verdigris River the highway soon enters Wagoner, where it junctions with US 69. Returning once again to a 2 lane road, Highway 51 crosses Ft. Gibson Lake and the town of Hulbert. 11 mile (18 km) later, it passes through Tahlequah, where it has a brief concurrency with US 62/SH 10. After spitting with these highways, it heads southeast toward Stilwell, Oklahoma, running concurrent with US 59 for a mile on the way. After leaving Stilwell it provides access to Adair State Park, and then crosses the Arkansas line becoming Arkansas Highway 244, which quickly connects to Arkansas Highway 59.

SH 51 was originally commissioned on June 1, 1927 as a connector from Stilwell to Eldon at SH 27 (present day US 62). By 1928, it had been extended to Tulsa. On June 15, 1933, it was extended to the east to the Arkansas state line, where it became AR 45. On March 18, 1935, the section from Stillwater to Perry was rescinded and SH 51 was extended to SH 8 at Okeene. It was then extended to Seiling on October 18, 1938. On March 23, 1943, it was extended to the Texas state line by a concurrency with US 60. The Broken Arrow Expressway was built in the early 1960s and opened in 1964. by H. B. 1455. The steel truss bridge carrying SH 51 across Stillwater Creek west of Stillwater, once considered the gateway into the city, was removed on March 25, 2008. In a first for the state of Oklahoma, the bridge, originally built in 1936, was sold to Payne County for $200,000 and transferred to a county road east of Stillwater, where it was installed over Council Creek.