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Scientific Investigations Report 2010–5040

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Groundwater Conditions During 2009 and Changes in Groundwater Levels from 1984 to 2009, Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho

Table 1. Change in groundwater levels in wells in the Columbia Plateau Regional Aquifer System, Washington, Oregon, and Idaho, from spring 1984 to spring 2009.

[Negative values indicate a decline in groundwater levels]

  Hydrogeologic unit
Overburden Saddle Mountains Wanapum Grande Ronde
Number of wells 197 50 87 136
Change in groundwater level, in feet
Maximum decline -147 -244 -249 -298
Maximum rise 44 77 94 90
Mean change -7 -12 -33 -51
Annualized change in groundwater level, in feet per year
Maximum rate of decline -5.9 -9.8 -9.9 -11.9
Maximum rate of rise 1.8 3.1 3.8 3.6
Mean rate of change -.3 -.5 -1.3 -2.0

For additional information contact:
Oregon Water Science Center Director
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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