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U.S. Geological Survey

Ground-Water Pumpage in the Willamette Lowland Regional Aquifer System, Oregon and Washington, 1990

By Charles A. Collins and Tyson M. Broad

USGS Water-Resources Investigations Report 96-4111, 27 pages, 6 figures, 1 table


Ground-water pumpage for 1990 was estimated for an area of about 5,700 square miles in northwestern Oregon and southwestern Washington as part of the Puget-Willamette Lowland Regional Aquifer System Analysis study. The estimated total ground-water pumpage in 1990 was about 340,000 acre-feet. Ground water in the study area is pumped mainly from Quaternary sediment; lesser amounts are withdrawn from Tertiary volcanic materials. Large parts of the area are used for agriculture, and about two and one-half times as much ground water was pumped for irrigation as for either public-supply or industrial needs. Estimates of ground-water pumpage for irrigation in the central part of the Willamette Valley were generated by using image-processing techniques and Landsat Thematic Mapper data. Field data and published reports were used to estimate pumpage for irrigation in other parts of the study area. Information on public-supply and industrial pumpage was collected from Federal, State, and private organizations and individuals.

Report availability:

This report is available online. Please visit our Online Publications page.

The printed version of the full report is available free (while supplies last) from:

U.S. Geological Survey, 10615 S.E. Cherry Blossom Drive, Portland, OR 97216 (ph: 503-251-3201, e-mail

and (at a nominal charge) from:

U.S. Geological Survey, Information Services, Box 25286, Denver, CO 80225 (ph: 1-888-ASK-USGS, e-mail

Note: When ordering the report, please supply the report title and number, your name, and your mailing address. Thank you.

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Last modified: 12/28/00