Contact(s)
- Learn how to read these charts on our River and stream flows page.
- This river data can be downloaded from our Data Downloads page.
Provisional Data
Caution: Users of the GRCA's real-time data are cautioned to consider the provisional nature of the information before using it for decisions that concern personal or public safety or the conduct of business.
The Grand River Conservation Authority assumes no responsibility for the correctness of the information contained in this website nor liability to any user of such information, regardless of the purpose.
Warning! River levels and flows can change rapidly.
Critical flows
This chart will help you understand the significance of various flows levels. The chart shows the name of the gauge, the affected communities and various flow levels along with the significance of that flow level. Flows are measured in cubic metres per second, i.e. the amount of water flowing past a spot in one second.
| Gauge | Community | Flow (m3/s) | Significance |
| West Montrose | West Montrose | 5 | Normal summer low flow |
| 125 | Campground floods | ||
| 280 | Village floods | ||
| 670 | 1974 flood | ||
| Bridgeport | Bridgeport | 11 | Normal summer low flow |
| 265 | Water at banks; low-lying areas flooded | ||
| 1,300 | 1974 flood | ||
| 1,700 | Dike capacity | ||
| Victoria St. | Kitchener | 265 | Water at banks; low-lying areas flooded |
| Beaverdale | See Speed & Eramosa River chart | ||
| St. Jacobs | See Conestogo River chart | ||
| Doon | Kitchener | 11 | Normal summer low flow |
| 320 | Water at banks; low-lying areas flooded | ||
| 1,420 | 1974 flood | Galt | Cambridge (Galt) | 15 |
Normal summer low flow |
| 400 | Water at banks; low-lying areas flooded | ||
| 638 | Water St. closed south of Ainslie | ||
| 1,050 | Concession St. bridge closed | ||
| 1,472 | Main St. bridge closed | ||
| 1,550 | 1974 flood | ||
| 1,628 | Parkhill St. bridge closed | ||
| 2,352 | Dike capacity | ||
| Brantford | Brantford | 20 | Normal summer low flow |
| 400 | Water at banks; low-lying areas flooded | ||
| 600 | Gilkison St. closed | ||
| 1,800 | 1974 flood | ||
| 3,400 | Dike capacity | ||
| Brantford | Caledonia | 400 | Water at banks; low-lying areas flooded |
| 1,040 | Caledonia Arena floods | ||
| 1,800 | 1974 flood | ||
| Brantford | Six Nations | 555 | Fourth Line floods |
| York | York | 22 | Normal summer low flow |
| 300 | Water at banks; low-lying areas flooded | ||
| York | Cayuga | 300 | Water at banks; low-lying areas flooded |
| 300 | Campground flooding on Lower Grand | ||
| 600 | Grand Sports Road floods | ||
| 1,800 | 1974 flood |
Location of flow gauges in the Central Lower Grand River area
