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Age Formation Sedimentary Interbed Aquifer Holocene and Pleistocene Loess, alluvial, lacustrine, and glacial flood deposits Alluvial Aquifer Rattlesnake Ridge Selah Wanapum Aquifer Miocene Saddle Mountains Basalt Saddle Mountains Aquifer Mabton Wanapum Basalt Vantage Grande Ronde Basalt Grande Ronde Stratigraphy in the Rock Creek Subbasin Figure 2 V:\030009 WRIA 31\Final Rock Creek Report\FinalRockTablesFigures - Figure2 ---PAGE BREAK--- 0.1 1 10 100 1000 10000 Water Year Mean Daily Discharge in cfs Rock Creek near Roosevelt 1963 1967 1966 1965 1964 1968 December 23, 1964 Mean Daily Flow of 4800 cfs Rock Creek Hydrograph for Water Years 1963-1968 Figure 3 V:\030009 WRIA 31\Final Rock Creek Report\FinalRockTablesFigures - Figure3