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The Washington State Water Supply Bulletin series is a valuable collection of reports presenting information about the state's freshwater resources. The bulletins, many of which were authored by U.S. Geological Survey researchers in cooperation with the state, include data on conditions in Washington as far back as 1878. Intact hard copies of these documents have been getting more difficult to find over time, so the bulletins have been scanned into PDF format for easy access.
The bulletins have been subdivided into five major topic areas: reports on state Geology and Groundwater Resources, comprehensive studies of Hydrologic Systems, Lakes studies, and historic data summaries of Snowfall and Stream Flow. At the top of each of these subject pages you'll see a state map. Click the corresponding bulletin number for the study area you're interested in to see the bulletin title. Click that title to see a short description of the bulletin and a further link to the scanned report and/or map plates. Alternatively, you can choose a bulletin from an Indexed Bulletin List.
At this time, many of the PDF files are quite large; in the coming months we hope to break each of the bulletins into smaller parts for easier downloading.
For more information about the Environmental Assessment Program groundwater team activities, please see Groundwater assessment in Washington state.
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