Records of the Central Arizona and Boulder Canyon Project, comprised of selections from the Carl T. Hayden Papers and other sources. As Arizona Congressman from 1911-1970, Hayden influenced natural resource development, water reclamation, and land-use management, culminating in 1968 with the Central Arizona Project (CAP) to transport Colorado River water to Phoenix and Tucson via a series of aqueducts.

The Colorado River Central Arizona Project Collection is part of The Western Waters Digital Library (WWDL) which contains government reports, classic water literature, legal transcripts, water project records, personal papers, photographic collections, and video materials about the Columbia, Colorado, Platte, and Rio Grande river basins. Please see the Guide to the Collections for more information.

The WWDL is a collaborative regional project created by twelve university libraries in eight western states. The WWDL provides search results taking you to the websites of contributing institutions where you can search further, create your own list of favorites, and manipulate or compare and contrast images. How to Use this Site explains these features.