 He initially settled at the mouth of the Susquehanna River on the Chesapeake, on the lower end of a floodplain called the Conejohela Valley, and built boats.In 1725 Cresap married Hannah Johnson, whose father, Thomas Johnson, on 24 March 1725 had surveyed to himself Mount Johnson Island, at Peach Bottom Ferry.Cresap also traveled at least once to Virginia, for Virginia-based trader Claiborne also traded for furs in the lower Susquehanna area of Chesapeake Bay.