Working in the Grand and Speed River Floodplains
If your Cambridge property is in or near a river valley, check the Grand River Conservation Authority mapping before any digging. Since April 1, 2024, grading, filling and building in regulated areas such as floodplains, valley slopes and wetlands need a GRCA permit under O. Reg. 41/24, the province-wide regulation that replaced the GRCA's own.
The Speed River meets the Grand in Cambridge, so parts of Preston, the Galt core and Hespeler fall inside regulated limits. Fill placement and new structures are the activities most likely to need approval.
Galt knows the risk first-hand. On May 17, 1974, the Grand spilled into downtown Galt with water up to about 1.8 m (6 ft) deep on some streets, which led to a provincial inquiry, river dredging, new berms and the flood wall the City still practises putting up.
For our crews, floodplain work means silt fence and sediment control before the first bucket, no stockpiles on the river side, and spoil hauled off the same day where the permit requires it. We pull the mapping for your lot and supply excavation details for your GRCA permit application.