Fonds consists primarily of records relating to the operation and activities of the Grand River Conservation Commission from 1938 to 1966, mostly records maintained by successive secretary-treasurers, but including some chairman's files (William Philip), and operations files. Includes a wide range of documentation, including correspondence, financial records, minutes, personnel records, reports, maps and plans and environmental monitoring records. Documentation includes construction of the Shand and Conestogo Dams, property acquisition and management, relations and interactions with municipalities and government departments at the provincial and federal levels, flood management and monitoring, implementation and management of health care, unemployment insurance, provincial and federal taxes, rental and leasing of cottage lots and other properties, reforestation and nursery operations, management of motor vehicles and other equipment.