Ground-Water Hydrology of the Upper Klamath Basin, Oregon and ...

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56 Ground-Water Hydrology of the Upper Klamath Basin, Oregon and California 0 2 36S/14E-25BCB 4 6 8 10 12 14 16 18 20 DEPTH TO WATER, IN FEET 60 62 64 66 68 70 72 39S/11E-20AAD 74 10 12 41S/14E-08CCA 14 16 18 20 22 24 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 26 28 30 Figure 32. Water-level fluctuations in wells 36S/14E-25BCB near Bly, 39S/11E-20AAD near Bonanza, and 41S/14E- 08CCA in the southern Langell Valley, Oregon. OR19-0048_fig32
Ground-Water Hydrology 57 Water levels in two observation wells near the town of Sprague River, 36S/10E-14ACC and 36S/11E-20DCA (fig. 33), have declined over 30 ft since monitoring began in the early 1960s. Leonard and Harris (1974) hypothesized that the relatively steady, and somewhat localized, longterm decline represented a loss of hydraulic head caused by discharge from free-flowing wells. The OWRD later attributed the decline, at least in part, to some wells in the area constructed in a manner that allowed ground water from a the confined basalt aquifer in the lower parts of the wells to flow uphole and into sedimentary units (with lower head) in shallower parts of the well bores (Oregon Water Resources Department, 1987). Borehole geophysical logging has confirmed the interaquifer leakage; however the geologic units receiving the leakage appear to be rhyolitic lavas mapped in the area by Sherrod and Pickthorn (1992) (Mark Norton, Oregon Water Resources Department, unpub. data). For example, geophysical logs for one nearby well show uphole interaquifer flow of about 200 gal/min into a unit with a relatively high natural gamma signature indicative of silicic material. The driller described the material as “broken lava rock.” Water levels in both wells have been more stable since the mid-1990s (fig. 33), likely owing to the ground-water-flow system beginning to reach a new equilibrium. Water levels in long-term observation well 46N/01E- 06N01 in Butte Valley were stable from the 1950s to the mid- 1970s (fig. 34). Since 1975, the water level has declined about 20 ft. The trend likely reflects increased pumping stresses during times when precipitation is low, with intermittent times of partial recovery during wet years in the mid-1980s and mid- 1990s. An observation well in southern Poe Valley (40S/11E- 11BAD) shows a series of responses to development from which it has never fully recovered (fig. 35). Most notable is the water-level decline of about 20 ft between 1985 and 1995, a recovery of less than 5 ft between 1995 and 1998, and a decline of about 12 ft since 1998. Another observation well (40S/12E-30DCB) about 3 mi south-southeast of the Poe Valley well, in the area of the Shasta View Irrigation District, has a similar water-level trend where the records overlap from 1994 to present (fig. 35). The total decline in well 40S/12E- 30DCB since 1998, however, is slightly greater at about 19 ft. The similarity of the head fluctuations suggests that the effects of pumping stresses in both areas may migrate across the subbasin boundary. 0 10 36S/10E-14ACC 20 30 40 50 DEPTH TO WATER, IN FEET 60 70 80 90 40 50 60 70 80 90 100 1960 36S/11E-20DCA 1965 1970 1975 1980 1985 1990 1995 2000 2005 Figure 33. Water-level fluctuations in wells 36S/10E-14ACC and 36S/11E-20DCA in the Sprague River Valley, Oregon.
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Prepared in cooperation with the Or
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Ground-Water Hydrology of the Upper
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iii Contents Abstract..............
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Figures Figure 1. Map showing the u
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vii Figures—Continued Figure 30.
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ix Location System The system used
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Ground-Water Hydrology of the Upper
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Creek Introduction 43°15' 43°00'
Page 17 and 18: Introduction MEAN MONTHLY PRECIPIT
Page 19 and 20: Introduction 122°00' 45' 30' 121
Page 21 and 22: Geologic Framework basins separate
Page 23 and 24: Creek Creek Geologic Framework 11 4
Page 25 and 26: Geologic Framework 13 Hydraulic con
Page 27 and 28: Geologic Framework 15 Table 2. Summ
Page 29 and 30: Ground-Water Hydrology 17 100 90 80
Page 31 and 32: Ground-Water Hydrology 19 The sourc
Page 33 and 34: Ground-Water Hydrology 21 determine
Page 35 and 36: Ground-Water Hydrology 23 Geographi
Page 37 and 38: Ground-Water Hydrology 25 TOTAL WAT
Page 39 and 40: Ground-Water Hydrology 27 DISCHARGE
Page 41 and 42: Ground-Water Hydrology 29 SEPTEMBER
Page 43 and 44: Ground-Water Hydrology 31 Upper Kla
Page 45 and 46: Ground-Water Hydrology 33 The Lost
Page 47 and 48: Ground-Water Hydrology 35 Most grou
Page 49 and 50: Ground-Water Hydrology 37 INFLOW, I
Page 51 and 52: Ground-Water Hydrology 39 example,
Page 53 and 54: Ground-Water Hydrology 41 Recent In
Page 55 and 56: Ground-Water Hydrology 43 122°00'
Page 57 and 58: Creek Ground-Water Hydrology 45 43
Page 59 and 60: Ground-Water Hydrology 47 5 ft/mi.
Page 61 and 62: Creek Ground-Water Hydrology 49 43
Page 63 and 64: Ground-Water Hydrology 51 DEPTH TO
Page 65 and 66: Ground-Water Hydrology 53 35 37 Dep
Page 67: Ground-Water Hydrology 55 4144 4143
Page 71 and 72: Ground-Water Hydrology 59 Long-term
Page 77 and 78: Acknowledgments 65 Hydraulic head i
Page 79 and 80: References Cited 67 Cooper, R.M., 2
Page 81 and 82: References Cited 69 Theis, C.V., 19
Page 83 and 84: Appendix A. 71 Appendix A. Landsat
Page 85 and 86: Table 6 73 Table 6. Estimated groun
Page 97 and 98: Manuscript approved for publication
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Ground-Water Hydrology of the Upper Klamath Basin, Oregon and ...

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