Accrual consists of materials relating to the Grand Valley Conservation Authority and its predecessors. Includes materials relating to the activities, events, employees and land ownership of the GRCA. Includes committee and meeting minutes, photographs, reports, maps, etc.

Fonds consists of records relating to the administration and operation of the Grand River Conservation Authority and its predecessors, the Grand River Conservation Commission and the Grand Valley Conservation Authority, from 1966 to 2006. Includes clippings, correspondence, minutes, visual and sound materials, reports and studies, maps, etc.

The Grand River Conservation Authority Library was donated in 2005, accompanying the archival records of the Authority and its predecessors.

The Library was maintained at the GRCA headquarters for reference and research use and consists of works by and about the GRCA, including both internal and external reports and studies, periodicals, and monographs.

Unpublished library items are described as part of the GRCA archives while published items are catalogued as print material and are listed in the library catalogue.