Ground-water resources in the Hood Basin, Oregon

Open-File Report 81-1108



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The Hood Basin in north-central Oregon consists of about a 1 ,035-square-mile area underlain by Miocene to Holocene age volcanic, volcaniclastic, sedimentary rocks, and unconsolidated surficial deposits. The most important aquifer is the Columbia River Basalt Group, a unit that underlies most of the basin and probably exceeds a thickness of 2,000 feet wherever it is present. By 1980, only the upper 1,000 feet or less of the formation has been developed for water supplies. Most of this development is in the semiarid eastern half of the basin. Wells in the aquifer unit generally yield from 15 to 1,000 gallons per minute and a few yield as much as 3,300 gallons per minute. Other aquifer units in the basin have more limited areal extent and smaller saturated thickness than does the Columbia River Basalt Group. Generally, these units are capable of yielding from a few to a few hundred gallons per minute to wells. Most of the ground water in the basin is chemically suitable for domestic, irrigation, or other uses. Some ground water has objectionable concentrations of iron (0.3 to 6.4 mg/l) and manganese (0.05 to 1.2 mg/l) or is moderately hard to very hard (60 to 260 mg/l) as calcium carbonate. (USGS)

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Ground-water resources in the Hood Basin, Oregon
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Open-File Report
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viii, 68 p. : ill., maps ; 28 cm.