Restoring the Great Lakes Areas of Concern Data
This table shows the number of Beneficial Uses listed as “impaired” and as “requires further assessment” for the 17 Canadian Great Lakes Areas of Concern between their first assessment and 2012. During that period, 3 Areas of Concern were considered fully restored, and 2 were considered Areas in Recovery.
| Lake | Area of concern | Initial assessment – Impaired | Initial assessment – Requires further assessment | Year | 2003 – Impaired | 2003 – Requires further assessment | 2012 – Impaired | 2012 – Requires further assessment |
|---|---|---|---|---|---|---|---|---|
| Superior | Thunder Bay | 10 | 1 | 1991 | 9 | 0 | 5 | 5 |
| Superior | Nipigon Bay | 7 | 1 | 1991 | 5 | 0 | 3 | 1 |
| Superior | Jackfish Bay | 6 | 2 | 1991 | 6 | 1 | 3* | 2* |
| Superior | Peninsula Harbour | 5 | 1 | 1991 | 5 | 0 | 5 | 1 |
| -- | St. Marys River | 9 | 1 | 1992 | 9 | 1 | 9 | 1 |
| Huron | Spanish Harbour | 5* | 4* | 1993 | 3* | 0* | 3* | 0* |
| Huron | Severn Sound | 6 | 2 | 1988 | 0** | 0** | 0** | 0** |
| Huron | Collingwood Harbour | 3 | 0 | 1989 | 2** | 0** | 2** | 0** |
| -- | St. Clair River | 9 | 3 | 1991 | 9 | 3 | 8 | 3 |
| -- | Detroit River | 8 | 0 | 1991 | 9 | 2 | 9 | 2 |
| Erie | Wheatley Harbour | 5 | 0 | 1998 | 5 | 1 | 0** | 0** |
| -- | Niagara River | 8 | 2 | 1993 | 6 | 3 | 6 | 1 |
| Ontario | Hamilton Harbour | 11 | 1 | 1992 | 8 | 3 | 8 | 3 |
| Ontario | Toronto and Region | 8 | 1 | 1989 | 8 | 3 | 8 | 2 |
| Ontario | Port Hope Harbour | 1 | 0 | 2003 | 1 | 0 | 1 | 0 |
| Ontario | Bay of Quinte | 8 | 3 | 1990 | 10 | 1 | 9 | 1 |
| -- | St. Lawrence River | 11 | 3 | 1992 | 7 | 3 | 3 | 0 |
* Area in recovery
** Restored
Note: For the complete data set from 1987 to 2012, please see the data file.
Download data file (Excel/CSV; 6.4 KB)
Go to indicator chart
- Date Modified: