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
Ogdensburg and Lake Champlain Railroad overhead walkway gone since 1949, now an Elm Street bank), Brushton (storage), Moira (church), and Lisbon (museum). Freighthouses remain at Winthrop and Champlain. Ogdensburg and Lake Champlain Railroad The Ogdensburg and Lake Champlain Railroad was founded in 1849 as the Northern Railroad running from Ogdensburg to Rouses Point, New York. The railroad was leased by rival, Central Vermont Railroad for several decades, ending in 1896. It was purchased in 1901 by the Rutland Railroad and became the Ogdensburg Division. The Ogdensburg Division represented the Rutland Railroad's expansion across the top of New York state, to the St. Lawrence River and