North Bay sits right where the Canadian Shield meets the St. Lawrence Lowlands, but most of the city is draped in a thick blanket of glacial till and glaciolacustrine clays left behind by Lake Algonquin, the ancient predecessor of modern Lake Nipissing. That means you can go from exposed Precambrian granite on one lot to thirty meters of saturated silty clay on the next — and guessing wrong gets expensive. Electrical resistivity methods, particularly Vertical Electrical Sounding, cut through that guesswork by mapping how easily current flows through the subsurface. In our experience, a well-calibrated VES survey in North Bay can differentiate clean sand aquifers from the Champlain Sea-type clays, pinpoint the bedrock interface, and flag zones where road salt or former rail-yard activities may have altered pore-water chemistry. We often pair the results with a CPT test to directly measure tip resistance and pore pressure in the soft sediments, which gives a ground-truthed tie between the geophysical model and the actual soil behavior before anyone puts a shovel in the ground.
Resistivity in North Bay is less about finding water and more about mapping the clay-bedrock transition that governs excavation stability and foundation cost.
