Oklahoma State Route 87 is a east-west highways in Southeastern Oklahoma. This highway runs entirely in Mc Curtain County. OK St Rt 87 passes through the following towns in Mc Curtain County. Idabel Harris OK St Rt 87 is multi-plexed in Mc Curtian County. U.S. Rt. 259, from Idabel to near Harris. OK St Rt 87 intersects the following highways in Mc Curtain County. Arkansas State Route 108, at the Oklahoma/Arkansas State Line. U.S. Rt. 259, near Harris.