 In 1914, the New York State Legislature added two spur routes to Route 30, an unsigned legislative route extending from Niagara Falls in western Niagara County to Rouses Point in Clinton County via Medina. The first of these began at Route 30 (modern NY 63) and followed what is now NY 31E west to Middleport, from where it continued toward Lockport on current NY 31. On March 1, 1921, most of Route 30's Medina – Lockport spur route was supplanted by an extended Route 20. The lone exception was from Medina to Middleport, where Route 20 utilized modern NY 31 instead. When the first set of posted routes in New York were assigned in 1924, all of legislative Route 20 west of Rochester became part of NY 3.
