Allegheny Portage. The 23-mile crossing from Susquehanna West Branch to the Allegheny River followed Portage Creek to a "canoe place" near this point. From here Indians and pioneers continued on their way by boat down the Allegheny River. Junction U.S. 6 & Pa. 155, Port Allegany, PA by Pennsylvania Historical and Museum Commission Colour: blue Wikimedia: Flickr: Google Streetview OpenStreetMap