Saint Lawrence River Divide

A map of the principal hydrological divides of North America. The Eastern Continental Divide (orange line) demarcates two watersheds of the Atlantic Ocean: the Gulf of Mexico watershed and the Atlantic Seaboard watershed.

The Saint Lawrence River Divide separates the Great Lakes Basin from the rest of the Atlantic Ocean watershed. Two canals cross the divide: The Chicago Sanitary and Ship Canal crosses the Chicago Portage and connects Lake Michigan to the Mississippi River watershed. The Erie Canal connects Lake Erie to the Hudson River watershed. Historically there were additional canals, e.g., the Ohio and Erie Canal, but most of these are no longer in operation.

SLRD points

Area	Point	Summit or other feature
Minnesota: The Hill of Three Waters[1]	1,732 feet (528 m) 47°28′21″N 92°57′51″W / 47.472366°N 92.964181°W	triple watershed point: watersheds of the Hudson Bay, Gulf of Mexico, & Gulf of Saint Lawrence.
Ohio: U.S. Interstate 75	1,023 feet (312 m) 40°29′03″N 84°10′10″W / 40.48426°N 84.16952°W	I-75 passes over the Saint Lawrence River Divide between Pusheta Creek (Great Lakes Basin) and Loramie Creek (Mississippi basin) near mile marker 105 (kilometer 165).[2]
Pennsylvania: Interstate 86	1,488 feet (454 m) 42°08′20″N 79°49′26″W / 42.138779°N 79.823920°W	crossing 1 of 5
New York: Interstate 86	1,650 feet (500 m) 42°08′38″N 79°40′22″W / 42.143894°N 79.672828°W	crossing 2 of 5
New York: Interstate 86	1,579 feet (481 m) 42°08′52″N 79°39′12″W / 42.147870°N 79.653323°W	crossing 3 of 5
New York: Interstate 86	1,797 feet (548 m) 42°12′44″N 78°12′31″W / 42.212286°N 78.208695°W	crossing 4 of 5
Pennsylvania: Eastern Triple Divide	2,523 feet (769 m) 41°50′48″N 77°50′14″W / 41.84667°N 77.83722°W	triple watershed point: watersheds of the Atlantic Seaboard, Gulf of Mexico, & Gulf of Saint Lawrence at the respective headwaters of Pine Creek (West Branch Susquehanna River), the Allegheny River, and the Genesee River.
New York: Interstate 86	2,104 feet (641 m) 42°18′40″N 77°51′47″W / 42.311058°N 77.863099°W	crossing 5 of 5

References

1. Gonzalez, Mark; Joel Festa (2007). "Continental Divides in North Dakota and North America" (PDF). NDGS Newsletter. North Dakota Geographical Society. Retrieved 2016-01-19.
2. "USGS/contours ArcGIS". ArcGIS. State of Ohio Dept. of Natural Resources. Retrieved 15 May 2016.