This report presents hydrogeologic and water-quality data for the Lower Sioux Indian Community during 1995-97, collected by the U.S. Geological Survey in cooperation with the Lower Sioux Indian Community. The data collected include: (1) water levels, temperature, and dissolved oxygen of Larson Lake, including a vertical profile of temperature and dissolved oxygen near the center of the lake; (2) lake depths of Larson Lake; (3) water level in the Columbus wetland; (4) geologic logs at 13 sites; (5) texture analysis of selected samples from auger cuttings at 5 sites; (6) water levels in 13 observation wells; (7) specific conductance, pH, temperature, dissolved oxygen, and hardness in 15 ground-water sites and 6 surface-water sites; (8) major and minor ions, and trace-metal concentrations of water at 15 ground-water sites and 5 surface-water sites; (9) fecal coliform and fecal streptococcal bacteria colony counts in water at 6 ground-water sites; (10) nutrient concentrations of water at 13 ground-water sites and 4 surface-water sites; and (11) pesticides in water at 4 ground-water sites and 1 surface-water site.
