Geohydrologic and chemical data from wells in the Mud Lake area, eastern Idaho, 1988-91

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.