In October 1750, Washington relinquished his position as county surveyor. He continued professionally for two more years, mostly in Frederick County, before receiving a military appointment as adjutant for southern Virginia. Other factors such as his own awareness of diminishing amounts of desirable land in Virginia and the death of his half-brother Lawrence in 1752 may have contributed to Washington's disillusionment with surveying as a career.
Surveying for Himself
Although Washington did not survey professionally after 1752, he continued to utilize his surveying skills. He completed at least 50 more surveys, often for the purpose of acquiring new land for himself, defending his property boundaries, or dividing his holdings into profitable farms. At one time, Washington owned nearly 70,000 acres between the Potomac and Ohio Rivers.
He continued to survey as late as November 5, 1799, when he "Set out on a trip to Difficult-run to view some Land I had there & some belonging to Mr. Jn° Gill who had offered it to me in discharge of Rent which he was owing me." George Washington died five weeks later ending a surveying career that spanned a half-century.