A Peculiar River

Published through the yankee Geophysical Union as a part of the Water technology and alertness Series.

The Deschutes is a "peculiar" dammed river in Oregon. Its dramatic juxtaposition of geology, topography, and weather provides a digital textbook of landforms and geomorphic tactics revealing Quaternary, Holocene, and extremely contemporary occasions of titanic value. alongside the lively volcanism and tectonism, the current riverine panorama displays this episodic geomorphic historical past, as remnants of fluviatle good points, large bars and boulders, mantle the panorama. A atypical River: Geology, Geomorphology, and Hydrology of the Deschutes River, Oregon tells a desirable tale a couple of "striking, occasionally intimidating, panorama that serves to query generalities and is a laboratory during which to check distinct landforms and the procedures that produce them."Content:

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These older deposits bound the permeable younger units. Where deposits of the John Day and Clarno Formations occur upgradient of the younger more permeable deposits, they contribute only min­ imal water to the regional groundwater system due to their low permeability and the fact that they occur primarily in the drier, eastern parts of the basin where little recharge occurs. Where the John Day and Clarno Formations occur downgradient from the younger more permeable deposits, they impede subsurface flow, diverting most groundwater flow out to springs and streams.

S. Geol. Surv. Bull. , 1905. Sarna-Wojcicki, A. , and J. O. , Geol. Soc. , The geology of North America (K-2), edited by R. B. Morrison, pp. 93-116, 1991. Scott, W. , Quaternary glaciation and volcanism, Metolius River area, Oregon, Geol. Soc. Am. Bull, 88, 113-124, 1977. , Geologic studies of Columbia River basalt structures and age of deformation, The Dalles-Umatilla region, Washington and Oregon, Boardman Nuclear Project, report to Portland General Electric Company, Portland, Oregon, 52 pp. 1973.

Schematic east-west section across the upper Deschutes River basin showing the generalized hydrogeologic setting, head distribution, and flow directions. 44 GROUNDWATER HYDROLOGY OF THE UPPER DESCHUTES BASIN 14. X Climate station in or near upper Deschutes River basin Springs discharging groundwater characterized by: • deepflow,magmatic C, geothermal warming O shallow flow, no magmatic C, no geothermal warming 12 13 Q Metolius R. near headwaters & Spring R. X 6. X p i I H ** >. 4 Quinn ] Cultus •j Estimated range of mean annua!

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