High Quality Content by WIKIPEDIA articles! State Highway 251A, also known as SH-251A or OK-251A, is a highway maintained by the U.S. state of Oklahoma. The highway has a length of 5.37 miles (8.64 km) in Wagoner County and 0.69 miles (1.11 km) in Cherokee County, for a total length of 6.06 miles (9.75 km). The highway runs from State Highway 16 in Okay, Oklahoma to State Highway 80 north of Ft. Gibson. It runs across the dam of Fort Gibson Lake.