Champlain Valley southward into the Valley of Vermont. The Vermont Lowlands are primarily underlain by sedimentary rocks, especially limestone and shale, though metamorphic rocks such as marble and slate are also present. Lake Champlain is situated in the Champlain Valley between the Green Mountains of Vermont and the Adirondack Mountains of New York, drained northward by the Richelieu River into the St. Lawrence River at Sorel-Tracy, Quebec (northeast of Montreal). Major tributaries of Lake Champlain include Otter Creek and the Winooski, Missisquoi, and Lamoille rivers in Vermont, and the Ausable, Chazy, Boquet, and Saranac rivers in New York. Lake Champlain also receives
New York State Route 9B 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. The overlap remained in place as late as 1979; it was eliminated by 1993. New York State Route 9B New York State Route 9B (NY 9B) is a state highway located within Clinton County, New York, in the United States. The route serves as a connector between