St. Lawrence River Ecosystem
The Upper St. Lawrence River has a wonderfully complex ecosystem and is home to the Thousand Islands region, a globally unique archipelago.
Linking Great Lakes to the Ocean
The St. Lawrence River is one of the largest Rivers in the world, linking the Great Lakes to the Atlantic Ocean. The Great Lakes hold nearly 20% of the world's freshwater, placing the St. Lawrence River in a unique position. As the only natural outflow to the Great Lakes, the health of the St. Lawrence is forever directly tied to the health of one of the world's greatest freshwater ecosystems.
Flowing over ancient glaciated rock, the upper St. Lawrence River has formed a unique island paradise known as the Thousand Islands, consisting of 1,864 islands. The islands provide a variety of habitats supporting all kinds of plants and wildlife.
The St. Lawrence River valley is teeming with wildlife throughout the year.
The River is home to several species of concern including threatened and endangered species such as Blanding's turtle, bald eagles, osprey, black tern, and the Indiana bat.
Numerous north woods mammal species find their home on the shores and islands of the River including muskrat, beaver, flying squirrels, mink, deer, porcupine, and many others. Winter ice cover on the River provides important passage for animals from the shoreline and to/from many of the islands.
Known as one of the great freshwater sport fishing grounds in the northeast, anglers travel from around the country to fish for pike, bass (particularly smallmouth bass), and muskellunge on the River.
The St. Lawrence River Valley is a key part of the Atlantic Migratory Fly-Way - the main pathway for seasonal migration of many bird species. The region has also been listed as an Important Bird Area by Audubon New York.
Bald eagles, which have not been seen in the River valley for many years, are making a comeback and can be seen frequently on the River in the winter. Visit our bald eagle page to learn more.
The St. Lawrence River is home to extensive coastal wetlands which provide filtration for runoff, flood retention, and provide wildlife with food and shelter. Wetlands also act as a nursery for the species of the River including waterfowl, numerous fish species as well as amphibians and reptiles.
For more information about the River's ecosystem visit the following:
- Frontenac Arch Biosphere Reserve - The Canadian portion of the Thousand Islands region has been designated a United Nations Biosphere Reserve in recognition of the area's globally unique ecosystem.
- The Algonquin to Adirondack Conservation Association - Learn about the critical wildlife corridor that connects Ontario, Canada to the Adirondak mountains via the St. Lawrence River valley.
- Thousand Islands Land Trust - The Thousand Islands Land Trust is a not-for-profit land trust dedicated to the conservation and enhancement of the scenic, recreational, natural and historic character of the Thousand Islands Region.
- Great Lakes Information Network - A wealth of information about all things Great Lakes.
EPA Accepting Public Comments on Proposal to Ban the Dumping of Sewage from Boats into the St. Lawrence River
“It’s astonishing that in 2016, boaters can dump raw sewage into the St. Lawrence River. Declaring this area of the St. Lawrence a “no discharge zone” would provide cleaner water for people who use this river,” said Regional Administrator Judith A. Enck. “The EPA and New York State looked carefully at the information and agree that the St. Lawrence has enough facilities to remove treated waste from all types of vessels and keep it from entering the river.” read more
Meadow Marsh Wetlands Disappearing on the St. Lawrence River as Governments Delay
And with them, populations of species key to the River ecosystem health - Northern Pike, Black Tern, Least Bittern, King Rail and Muskrat read more
How invasive species changed the Great Lakes forever
A primer on invasive species in the St. Lawrence River and Great Lakes. Worth a re-read this Invasive Species Awareness Week. read more
Invasive Species Awareness Week to be annually held from July 12th-18th.
The New York State Executive Chamber Proclamation instated by Governor Cuomo declaring Invasive Species Awareness Week (ISAW) to be annually held from July 12th-18th. read more
Prevent the Spread of Aquatic Invasive Species
Important steps for anyone boating on the St. Lawrence River (and not just during Invasive Species Awareness Week) from the New York State Department of Environmental Conservation website read more
Invasive Species Awareness Week
We know a little bit about invasive species here on the St. Lawrence. In fact, we've become a vector for for their movement from our waters to others in the state and provinces. The invasion of non-native, harmful species goes back to at least the construction of the Erie Canal. But it wasn't until the opening of the River and the Great Lakes to international shipping in the 1950's that the scope and pace of the invasion threatened to completely upend the natural ecosystem and species dependent on it. read more
Happy World Wetlands Day 2015!
On the River, supporting wetlands means adopting Plan 2014 – a modern water levels plan that will restore 64,000 acres of wetlands on the St. Lawrence River and Lake Ontario read more
New Data Show Multiple Asian Carp eDNA Hits Just Yards from Lake Michigan
Asian carp continue to knock on the door of the Great Lakes, based on eDNA sampling results released last week by the U.S. Fish and Wildlife Service. The sampling data, collected in October, show the presence of bighead or silver carp DNA throughout the Chicago Area Waterway System (CAWS). read more
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