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River Facts


The St. Lawrence River is one of the longest rivers in North America. And, is the outflow for the entire Great Lakes system. The Great Lakes hold nearly 20% of the world's fresh water.

The River flows 744 miles from Lake Ontario into the world's largest estuary, the Gulf of St. Lawrence. Only 114 miles of the River are located in New York State.

The River is 250 feet at its deepest point.

Flowing through both Canadian and US lands, the St. Lawrence River is a bi-national waterway, providing drinking water to local municipalities on both sides of the River and a vital tourism-based economy to local towns.

The St. Lawrence River has a discharge rate of 347, 849 cubic feet of water per second.

The Upper St. Lawrence is home to the Thousand Islands region. There are exactly 1,864. To be counted as an island, the piece of land must be surrounded by water, above water all year long, and support at least one tree.

For more information about the St. Lawrence River and Thousand Islands, visit:

  • Seaway Trail - The Seaway Trail is a National Scenic By-Way that leads tourists along the many historic and natural features of the St. Lawrence River and Lake Ontario in New York state.
  • Thousand Islands Photo Art - View the Thousand Islands with a birds-eye view through the photography of Ian Coristine.
  • Thousand Islands Life - An on-line magazine devoted to the history and culture of the Thousand Islands region.

Latest News

Stormwater Rule Action Day – Tuesday, August 20, 2013
In order to raise the profile of polluted runoff and highlight the importance of moving forward on the national stormwater rule, we’re asking our members and followers to reach out to their Members of Congress. read more

Thank Congressman Owens for Plan 2014 Support
From Congressman Owens' letter to the IJC, "Plan 2014 is a pragmatic, comprehensive strategy that reasonably balances environmental and economic concerns. . . I am pleased to demonstrate my support for Plan 2014 . . ." read more

The Nature Conservancy on Plan 2014
The Nature Conservancy in New York makes it clear Plan 2014 is NOT an environment vs economy issue. Plan 2014 boosts both environment AND economy. Read their editorial in the Buffalo News and share. read more

Executive Director discusses GLEAM Project on WPBS Public Eye
The GLEAM research team built new tools to integrate spatial information for environmental management decisions on the Great Lakes. The goal was to build maps to visualize and understand environmental impacts on the lakes and benefits humans enjoy from the lakes; many, if not most of which make their way to the St. Lawrence River. read more

Video of Executive Director on WPBS Live!
Here is the link to our Executive Director’s appearance on WPBS Live! Wednesday night. read more

See our blog for more news!     

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Clayton, NY 13624
p: (315) 686-2010

River Photos

Off to the races by Pam Quimby  Resting by Pam Quimby  On the Rocks by Nick Apel  Classic Sunset by Barb Hupp  TI Park Library by Meg Kerr  Fall by Carrie Kerr  Girls by Juliane Bauer  Winter Navigation by Sherman Ward 
 Pictures from our Flickr photostream

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