Meeting minutes from the Air Pollution Control Advisory Board, which served in an advisory capacity to the City Council on air pollution issues.

Records relating to flood control in the basin of the Duwamish and Green Rivers, 1922-1975.

Snowpack data

Rainfall and other weather data for Seattle.

Environmental planning files.

Correspondence, memoranda, reports, studies, and agreements relating to Seattle Water Department activities and projects.

Photographic documentation of Seattle's creeks, including activities undertaken by the Water Department to test and improve water quality.

Public documents and research notes that were gathered in the process of writing a history of the Seattle Water Department.

Contents of a scrapbook documenting efforts by the Seattle Water Department to monitor and improve water quality.