HYDROLOGY AND GEOCHEMISTRY OF THERMAL GROUND WATER IN SOUTHWESTERN IDAHO AND NORTH-CENTRAL NEVADA.

THERMAL GROUND WATER OCCURS OVER A LARGE AREA SOUTH OF THE SNAKE RIVER IN OWYHEE AND TWIN FALLS COUNTIES IN SOUTHWESTERN IDAHO AND NORTHERN ELKO COUNTY IN NORTH-CENTRAL NEVADA. WELLS DRILLED FOR IRRIGATION GENERALLY YIELD THERMAL WATER, WHICH RANGES IN TEMPERATURE FROM 15 D. TO MORE THAN 80 D. C. THIS STUDY IS AN EFFORT TO FURTHER EVALUATE THIS LARGE RESOURCE AND IS PART OF A COMPREHENSIVE PROGRAM BY THE U. S. GEOLOGICAL SURVEY TO BETTER UNDERSTAND THE NATURE AND OCCURRENCE OF THE GEOTHERMAL RESOURCES IN THE UNITED STATES.