forts along the lower Susquehanna

[zimmerstutzen]

I live a few miles from the site of Cresap's Fort (1730's) a few miles south of modern Wrightsville PA.  Unfortunately, the site was flooded for a hydro-electric dam during the 20th century.  There were a number of small towns and a canal along the river, most of which is now submerged.  Cresap's Fort was built by a MArylander, trying to protect Maryland's claim to the land south of Wrightsville on the West side of the Suquehanna.  Cresap himself evicted many Pennsylvania settlers from their lands.  I know a string of frontier forts was built along the frontier in the 1750's to protect from the French and Indians.  But it seems if Cresap built a fort along the river, that other's must have built forts as well.  (Sometimes fort is a generous term for what existed)   Does anyone have any references to other forts along the lower Susquehanna before the 1750's?   

[Red Badger]

a quick google search turned up lots of articles (799,000) of which I  looked at this one and found it interesting: http://usgwarchives.net/pa/1pa/1picts/frontierforts/frontierforts.htm