Contents: Oregon lakes and fluctuations of Abert Lake Davis Lake, Oregon Early records on Tule Lake and Lost River in Oregon and California Surprise Valley lakes, California Medicine Lake, California Snag Lake, Lassen Volcanic National Park, California Crater Lake, Lassen County, California Honey Lake, Lassen County, California Horse Lake, Lassen County, California Enclosed lakes in northeastern Nevada History of Owens Lake.

The collection consists of correspondence; technical reports on various aspects of irrigation; reports and surveys of specific irrigation projects throughout California, and in Colorado, Idaho, Montana, Nevada, and North Dakota; and miscellaneous material relating to water costs and requirements, water rights, groundwater and surface water supply, flood control, legislation, dendroclimatology, enclosed lakes, and the Central Valley Project and Feather River Project in California.