The Castlegar Junction clay deposit is located along the banks of the Columbia River in Castlegar.
Limited deposits of silty clay occur close to river level and may have originated as either lake or glacial deposits. The material near Castlegar has apparently been used in the past for the manufacture of brick and is similar to the Nelson Clay (082FSW296) deposit.
Northwest of Castlegar along the Arrow Lakes there is a bluish grey laminated clay which outcrops at water level but is covered by thick overburden.