A quick clay soil from a site close to the Grande‐Baleine River on the west bank of Hudson Bay has been resedimented artificially. Specimens were formed at salinities of 0.2 and 35 g/L to simulate freshwater and marine environments. Under a consolidation pressure of 50 kPa, the specimens were shown to yield sensitivities from 5 to 26, the highest being for the low‐salinity specimens. The natural sensitivity (as measured with the fall cone) is greater than 300.