Introduction 1 Acknowledgments 3 Well-numbering system 3 Well information 5 Test drilling 5 Water levels in observation wells 9 Chemical and isotopic constituents in ground water References cited 16 IV

This report presents data collected during the period January 1989 through September 1990 from eight test holes and selected thermal-water wells and springs in the Indian Bathtub area, southwestern Idaho. The data include completion, lithologic, and gamma logs for eight test holes, hydrographs of water levels in the test holes and ten other wells, hydrographs of discharges at four springs, and chemical and isotopic analyses of water from six of the test holes. These data were collected as part of a continuing study to determine the cause or causes of decreased discharge at Indian Bathtub Spring and other thermal springs along Hot Creek. R.4E.

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