Oral history interview with Ken Billington, conducted by Clark Hansen on January 25, 2000, as part of the Columbia River Dissenters Oral History Series. Billington discusses his career in public power in Washington state, including as executive director of the Washington Public Utility Districts Association.

Unprocessed collection of miscellaneous records of the Bonneville Power Administration, including progress reports of the fish-passage research program, correspondence, and statistical data on the capacity of the Bonneville fishways.

Papers and records relating to the business interests of Philip Buehner (1858-1940), an engineer and lumberman. Buehner developed municipal water-supply projects in Washington state and Oregon, and, in partnership with with Wolff & Zwicker Iron Works, supplied pipelines for the Bull Run water system for Portland, Oregon. Buehner also operated multiple Oregon lumber companies.

The collection consists of narratives written by David Dexter Clarke concerning his professional experiences and personal history, along with notes and some items of correspondence. Clarke (1844-1923) emigrated to Oregon in 1864, and worked as a surveyor and civil engineer in the Pacific Northwest for 53 years. From 1893 until his retirement in 1917, he worked for the water bureau in Portland, Oregon, serving as the head of the department for most of that time.

Oral history interview with Beulah J. Hand conducted by Linda S. Dodds on September 1, 1981. Hand was an Oregon state representative for Clackamas County from 1957 to 1966.

Oral history interview with Allan Hart conducted by Jim Strassmaier from April 15 to July 22, 1986. Hart was an attorney in Portland, Oregon.

Collection consists of 10 mounted black and white photographs taken between 1912 and 1914 by E. J. Humbert, an electrician for the Portland Railway Light and Power Company. The photographs depict interior and exterior views of power plants, as well as street scenes in Portland and Oregon City, Oregon.

Photographs taken by Percy Albert Lockwood, a civil engineer and surveyor, from 1908 to about 1920. His images show several engineering projects in Oregon and Washington, including surveying crews, as well as some of his family life.

Oral history interview with George D. Rives conducted by William R. Long from October 7 to November 5, 2005, as part of the United States District Court Oral History Project. Rives was an attorney in Portland, Oregon.

Bound typescript carbon copy of "Umatilla Rapids Project, Oregon-Washington, Report on Investigations 1923-1924" by E. R. Crocker, Associate Engineer, U. S. Department of the Interior, Bureau of Reclamation, regarding the possibility of developing power at Umatilla Rapids on the Columbia River, with architectural drawings.