Montreal Island Sewer Overflow Structures and Locations

April 2026 data from the Government and Municipalities of Québec details the sewer system on the Island of Montreal. It includes 170 overflow structures that manage wastewater and stormwater, directing excess flow to the St. Lawrence River or Rivière des Prairies during heavy rain or maintenance events.

Use Cases

• Modeling combined sewer overflow (CSO) events based on the described overflow mechanism during rain or melt.
• Mapping sewer infrastructure assets for maintenance planning based on the 170 structure locations.
• Assessing potential watercourse pollution sources based on the described discharge points to the St. Lawrence River and Rivière des Prairies.

Strengths

• Includes 170 specific infrastructure assets (overflow structures).
• Data is geospatial, available in GeoJSON format for mapping and spatial analysis.
• Explicitly describes the operational logic of the sewer system during normal and overflow conditions.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic bias inherent to open_canada, focusing solely on Montreal Island.

Provenance

Source

Government and Municipalities of Québec | Gouvernement et municipalités du Québec

Collection Method

Likely collected and maintained as part of municipal infrastructure management.

Time Range

Data reflects the system state as of the last update in April 2026.

Freshness

Last updated 2026-04-22 17:33:10.417278; freshness should be verified.

Geography

Island of Montreal, Quebec, Canada, with outfalls to the St. Lawrence River and Rivière des Prairies.