Hydrogeologic framework of the Johns Creek subbasin and vicinity, Mason County, Washington

Scientific Investigations Report 2011-5168
Prepared in cooperation with the Washington State Department of Ecology
By:  and 



This report describes the hydrogeologic framework of the groundwater-flow system in the Johns Creek subbasin and vicinity. The study area covers 97 square miles in southeastern Mason County, Washington, and includes the Johns Creek subbasin, which drains an area of about 11 square miles. The study area extends beyond the Johns Creek subbasin to include major hydrologic features that could be used as regional groundwater-flow model boundaries. The subbasin is underlain by a thick sequence of unconsolidated Quaternary glacial and interglacial deposits, which overlie Tertiary igneous and sedimentary bedrock units. Geologic units were grouped into eight hydrogeologic units consisting of aquifers, confining units, undifferentiated deposits, and an underlying bedrock unit. A surficial hydrogeologic map was developed and used with lithologic information from 200 drillers' logs to construct 4 hydrogeologic sections, and unit extent and thickness maps.

Study Area

Additional publication details

Publication type Report
Publication Subtype USGS Numbered Series
Title Hydrogeologic framework of the Johns Creek subbasin and vicinity, Mason County, Washington
Series title Scientific Investigations Report
Series number 2011-5168
DOI 10.3133/sir20115168
Year Published 2011
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Washington Water Science Center
Description Report: vi, 16 p.; Plate: 40.00 inches x 34.00 inches
State Washington
Additional Online Files (Y/N) Y
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