Annette M. Tungate T. L. Rogers Joseph M. Spinazola 1992 Well information, results of test drilling, water-level measurements in observation wells, and chemical and isotopic constituents in ground-water samples were among the data collected as part of a study of the availability of ground water from the eastern Snake River Plain aquifer system in the Mud Lake area of eastern Idaho. Data from about 1,200 wells were stored in the National Water Information System ground-water data base. Test holes were drilled at eight sites. Water levels were measured in 594 wells in April or May 1989 and in 470 wells in August or September 1989. Hydrographs of water levels were constructed for 99 observation wells. Water samples were collected from nine irrigation wells and were analyzed for nutrients, common dissolved ions, stable isotopes of hydrogen and oxygen, trace elements, herbicides, insecticides, and polychlorinated compounds. application/pdf 10.3133/ofr92133 en U.S. Geological Survey Geohydrologic and chemical data from wells in the Mud Lake area, eastern Idaho, 1988-91 reports