NY 73 was truncated to its current eastern terminus in Underwood on July 1, 1972, eliminating a lengthy overlap with US 9, while its former routing from Schroon to Lake Champlain was renumbered to NY 74, matching the other Vermont route number that ends in Larrabees Point. The already existing NY 74 in Chautauqua County (in the Jamestown area) was renumbered to NY 474 as a result. The opening of the Adirondack Northway in 1967 also resulted in a slight shift of the western terminus of NY 74 from US 9 to I-87. By 1981, NY 74 was rerouted to follow its current alignment around the northeastern edge of Ticonderoga, on a concurrency with NY 22. The highway has remained the same since that date.