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Upper St. Lawrence Valley

Ecoregion in Adirondack Mountains, NY

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The Upper St. Lawrence Valley is the more elevated and rolling portion of the valley, located south of the more level glacial marine and lake plains of the St. Lawrence Lowlands (83d) and slowly rising in elevation from about 500 feet to over 1400 feet near the boundary of the Northern and Western Adirondack Foothills (58ab). It includes the toeslopes of the Adirondack Foothills and the narrow Black River Valley between the Adirondacks and the Tug Hill Plateau. The underlying geology in the east is mostly sandstone; in the west, it is a mix of quartz, gneiss, and marble. Northern hardwoods dominate the hills, although small farms also occur in a landscape mosaic with abandoned fields and woodlots. Farms produce hay, grain, potatoes, and dairy products. In the Upper St. Lawrence Valley, the network of intersecting glacial outwash channels dominating the northern Adirondack Foothills (58ab) coalesces to form flowages, a series of swampy channels that feed the major rivers flowing north to the St. Lawrence River (e.g., the Salmon, St. Regis, Raquette, and Oswegatchie rivers).

— EPA

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