Publication Citation

USGS Series Open-File Report
Report Number 80-1049
Title Ground water in the northern part of Clackamas County, Oregon
Edition -
Language ENGLISH
Author(s) Leonard, A. R.; Collins, C. A.
Year 1983
Originating office
USGS Library Call Number (200) R29o no.80-1049
Physical description v, 107 p. :ill., maps ;28 cm.
ISBN

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Abstract

The number of domestic wells and domestic-water use have increased rapidly since 1960 in the 250-square-mile study area southeast of Portland, Oregon. The rolling upland area is underlain by volcanic and stream-deposited rocks, all units of which serve as aquifers locally. Depths of wells range from less than 50 to more than 1,000 feet and yields from less than one to several hundred gallons per minute. Local recharge rates are judged to be adequate for any forseeable projected development for domestic water supplies. Wells are expected to yield adequate water for domestic needs nearly everywhere in the study area. However, some exploration, as by test drilling, may be needed in siting irrigation, industrial, or public-supply wells of moderate to high yield. Additional ground water can be developed from all aquifers, but the Columbia River Basalt Group is considered susceptible to problems of overdevelopment locally. (USGS)