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 185 final curve to the northeast, NY 185 begins to cross Lake Champlain by way of the bridge. The route ends at the Vermont state line at the bridge's midpoint, and the roadway continues into Vermont as VT 17. The Champlain Bridge was built in 1929, connecting Crown Point in New York to Chimney Point in Vermont. A short connector highway between the bridge—which connected to VT 17 in Vermont—and NY 22 in Crown Point, named Bridge Road, was originally designated as NY 347 as part of the 1930 renumbering of state highways in New York. NY 347 became part of