Pennsylvania Statutes Title 36 P.S. Highways and Bridges § 1617. Route 641. From Beaver and Allegheny County line to West Bridgewater

Commencing at a point on the dividing line between Beaver and Allegheny counties, on the Beaver Road; thence by way of said Beaver Road, in Beaver County, to Merchant Street in the borough of Ambridge; thence over Duss Avenue, thru Harmony Township, to the borough of Baden; thence by way of the Philipsburg and Beaver Road, in Economy Township, to Conway Borough; thence through Conway Borough to Freedom Borough; thence through East Rochester and Rochester Borough to Big Beaver Bridge into West Bridgewater connecting with State highway route number two hundred and four.  1