 Highways were first signed in New York, at which time NY 6 was mostly absorbed into the new US 9, including within the town of Champlain.US 9 was realigned in the mid-1940s to bypass Rouses Point to the west and proceed north through the village of Champlain on its way to Canada.Its former alignment to Rouses Point was redesignated as NY 9B, which initially continued north along Lake Street to the Canadian border by way of an overlap with US 11.