SR 73 was extended the remaining 0.4 miles to the county line (replacing SR 619, which continued to exist in Scott County Virginia Department of Highways, Map of Scott County Showing Primary and Secondary Highways, revised July 1, 1935, reprinted in the 1940 Census ) in 1937, but in 1948 it was downgraded to secondary effective completion of ongoing construction work, for which the contract was awarded in November 1948.