St. Lawrence Basin Watershed Boundaries for Great Lakes

Watershed boundaries for the Lake Superior, Lake Huron, Lake Erie, Lake Ontario, and St. Lawrence River basins. The dataset is provided by the Government of Ontario and was last updated in March 2026.

Use Cases

• Delineate hydrological modeling domains using the Lake Superior and Lake Huron watershed boundaries.
• Analyze land use impacts on water quality across the Lake Erie and Lake Ontario watersheds.
• Assess cumulative drainage area contributions to the St. Lawrence River watershed.

Strengths

• Covers five major watersheds within the St. Lawrence Basin.
• Published and maintained by the Government of Ontario.
• Data was updated in March 2026.

Limitations

• The specific data format, attribute columns, and spatial resolution are not described.
• Sample data is unavailable for previewing structure or content.

Provenance

Source

Government of Ontario

Collection Method

null

Time Range

null

Freshness

Updated March 2026.

Geography

St. Lawrence Basin, including the Great Lakes watersheds.