U.S. Geological Survey

By Charles A. Collins and Tyson M. Broad

USGS Water-Resources Investigation Report 91-4018, 26 pages, 1 figure, 2 tables, 4 plates

Available from Available from U.S. Geological Survey, 10615 S.E. Cherry Blossom Drive, Portland, OR 97216 (ph: 503-251-3201, e-mail: or-info@usgs.gov) and from U.S. Geological Survey, Branch of Information Services, Box 25286, Denver, CO 80225 (303-202-4210).

Abstract

Data for ground-water pumpage were collected during an inventory of wells in 1987-88 in the Portland Basin located in northwestern Oregon and southwestern Washington. Estimates of annual ground-water pumpage were made for the three major categories of use: public supply, industry, and irrigation.

A large rapidly expanding metropolitan area is situated within the Portland Basin, along with several large industries that use significant quantities of ground water. The estimated total average annual ground-water pumpage for 1987 was about 127,800 acre-feet. Of this quantity, about 50 percent was pumped for industrial use, about 40 percent for public supply and about 10 percent for irrigation. Domestic use from individual wells is a small part of the total and is not included.

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