Pennsylvania State Route 51 is a north-south highway in Central Beaver County. It runs from the Beaver/Allegheny County Line, near South Heights, to the Pennsylvania/Ohio State Line, near East Palestine, Ohio. PA St Rt 51 passes through the following towns in Beaver County. South Heights Aliquippa Monaca East Rochester Rochester Bridgewater Beaver Falls Darlington PA St Rt 51 is multu-plexed in Beaver County. Pennsylvania State Route 65, at Rochester.
A guide marker on SB PA St Rt 18/65. A guide marker on SB PA St Rt 18/65. NB PA St Rt 51/WB PA St Rt 68 crossing the Beaver River. NB PA St Rt 51/WB PA St Rt 68 crossing the Beaver River. NB PA St Rt 51/WB PA St Rt 68 crossing the Beaver River. A BGS on SB I-376. A BGS on SB I-376.
